<html lang="en"> <head> <title>The influence of biological, epidemiological, and treatment factors on the establishment and spread of drug-resistant Plasmodium falciparum</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link href="https://unpkg.com/@stencila/thema@2/dist/themes/elife/styles.css" rel="stylesheet"> <script src="https://unpkg.com/@stencila/thema@2/dist/themes/elife/index.js" type="text/javascript"></script> <script src="https://unpkg.com/@stencila/components@<=1/dist/stencila-components/stencila-components.esm.js" type="module"></script> <script src="https://unpkg.com/@stencila/components@<=1/dist/stencila-components/stencila-components.js" type="text/javascript" nomodule=""></script> </head> <body> <main role="main"> <article itemscope="" itemtype="http://schema.org/Article" data-itemscope="root"> <h1 itemscope="" itemtype="http://schema.stenci.la/Array" itemprop="headline" content="The influence of biological, epidemiological, and treatment factors on the establishment and spread of drug-r…"> The influence of biological, epidemiological, and treatment factors on the establishment and spread of drug-resistant <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">Plasmodium falciparum</em></h1> <meta itemprop="image" content="https://via.placeholder.com/1200x714/dbdbdb/4a4a4a.png?text="> <ol data-itemprop="authors"> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Thiery Masserey"><span data-itemprop="givenNames"><span itemprop="givenName">Thiery</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Masserey</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Tamsin Lee"><span data-itemprop="givenNames"><span itemprop="givenName">Tamsin</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Lee</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Monica Golumbeanu"><span data-itemprop="givenNames"><span itemprop="givenName">Monica</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Golumbeanu</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Andrew J Shattock"><span data-itemprop="givenNames"><span itemprop="givenName">Andrew</span><span itemprop="givenName">J</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Shattock</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Sherrie L Kelly"><span data-itemprop="givenNames"><span itemprop="givenName">Sherrie</span><span itemprop="givenName">L</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Kelly</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Ian M Hastings"><span data-itemprop="givenNames"><span itemprop="givenName">Ian</span><span itemprop="givenName">M</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Hastings</span></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-3">3</a></span> </li> <li itemscope="" itemtype="http://schema.org/Person" itemprop="author"> <meta itemprop="name" content="Melissa A Penny"><span data-itemprop="givenNames"><span itemprop="givenName">Melissa</span><span itemprop="givenName">A</span></span><span data-itemprop="familyNames"><span itemprop="familyName">Penny</span></span><span data-itemprop="emails"><a itemprop="email" href="mailto:melissa.penny@unibas.ch">melissa.penny@unibas.ch</a></span><span data-itemprop="affiliations"><a itemprop="affiliation" href="#author-organization-1">1</a><a itemprop="affiliation" href="#author-organization-2">2</a></span> </li> </ol> <ol data-itemprop="affiliations"> <li itemscope="" itemtype="http://schema.org/Organization" itemid="#author-organization-1" id="author-organization-1"><span itemprop="name">Swiss Tropical and Public Health Institute</span><address itemscope="" itemtype="http://schema.org/PostalAddress" itemprop="address"><span itemprop="addressLocality">Allschwil</span><span itemprop="addressCountry">Switzerland</span></address></li> <li itemscope="" itemtype="http://schema.org/Organization" itemid="#author-organization-2" id="author-organization-2"><span itemprop="name">University of Basel</span><address itemscope="" itemtype="http://schema.org/PostalAddress" itemprop="address"><span itemprop="addressLocality">Basel</span><span itemprop="addressCountry">Switzerland</span></address></li> <li itemscope="" itemtype="http://schema.org/Organization" itemid="#author-organization-3" id="author-organization-3"><span itemprop="name">Liverpool School of Tropical Medicine</span><address itemscope="" itemtype="http://schema.org/PostalAddress" itemprop="address"><span itemprop="addressLocality">Liverpool</span><span itemprop="addressCountry">United Kingdom</span></address></li> </ol><span itemscope="" itemtype="http://schema.org/Organization" itemprop="publisher"> <meta itemprop="name" content="Unknown"><span itemscope="" itemtype="http://schema.org/ImageObject" itemprop="logo"> <meta itemprop="url" content="https://via.placeholder.com/600x60/dbdbdb/4a4a4a.png?text=Unknown"> </span> </span><time itemprop="datePublished" datetime="2022-07-07">2022-07-07</time> <ul data-itemprop="genre"> <li itemprop="genre">Research Article</li> </ul> <ul data-itemprop="about"> <li itemscope="" itemtype="http://schema.org/DefinedTerm" itemprop="about"><span itemprop="name">Epidemiology and Global Health</span></li> <li itemscope="" itemtype="http://schema.org/DefinedTerm" itemprop="about"><span itemprop="name">Microbiology and Infectious Disease</span></li> </ul> <ul data-itemprop="keywords"> <li itemprop="keywords">modelling and simulation</li> <li itemprop="keywords">drug resistance</li> <li itemprop="keywords">artemisinin combination therapy</li> <li itemprop="keywords">P. falciparum</li> </ul> <ul data-itemprop="identifiers"> <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier"> <meta itemprop="propertyID" content="https://registry.identifiers.org/registry/publisher-id"><span itemprop="name">publisher-id</span><span itemprop="value" data-itemtype="http://schema.org/Number">77634</span> </li> <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier"> <meta itemprop="propertyID" content="https://registry.identifiers.org/registry/doi"> <span itemprop="name">doi</span><span itemprop="value">10.7554/eLife.77634</span> </li> <li itemscope="" itemtype="http://schema.org/PropertyValue" itemprop="identifier"> <meta itemprop="propertyID" content="https://registry.identifiers.org/registry/elocation-id"><span itemprop="name">elocation-id</span><span itemprop="value">e77634</span> </li> </ul> <section data-itemprop="description"> <h2 data-itemtype="http://schema.stenci.la/Heading">Abstract</h2> <meta itemprop="description" content="The effectiveness of artemisinin-based combination therapies (ACTs) to treat Plasmodium falciparum malaria is threatened by resistance. The complex interplay between sources of selective pressure—treatment properties, biological factors, transmission intensity, and access to treatment—obscures understanding how, when, and why resistance establishes and spreads across different locations. We developed a disease modelling approach with emulator-based global sensitivity analysis to systematically quantify which of these factors drive establishment and spread of drug resistance. Drug resistance was more likely to evolve in low transmission settings due to the lower levels of (i) immunity and (ii) within-host competition between genotypes. Spread of parasites resistant to artemisinin partner drugs depended on the period of low drug concentration (known as the selection window). Spread of partial artemisinin resistance was slowed with prolonged parasite exposure to artemisinin derivatives and accelerated when the parasite was also resistant to the partner drug. Thus, to slow the spread of partial artemisinin resistance, molecular surveillance should be supported to detect resistance to partner drugs and to change ACTs accordingly. Furthermore, implementing more sustainable artemisinin-based therapies will require extending parasite exposure to artemisinin derivatives, and mitigating the selection windows of partner drugs, which could be achieved by including an additional long-acting drug."> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The effectiveness of artemisinin-based combination therapies (ACTs) to treat <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">Plasmodium falciparum</em> malaria is threatened by resistance. The complex interplay between sources of selective pressure—treatment properties, biological factors, transmission intensity, and access to treatment—obscures understanding how, when, and why resistance establishes and spreads across different locations. We developed a disease modelling approach with emulator-based global sensitivity analysis to systematically quantify which of these factors drive establishment and spread of drug resistance. Drug resistance was more likely to evolve in low transmission settings due to the lower levels of (i) immunity and (ii) within-host competition between genotypes. Spread of parasites resistant to artemisinin partner drugs depended on the period of low drug concentration (known as the selection window). Spread of partial artemisinin resistance was slowed with prolonged parasite exposure to artemisinin derivatives and accelerated when the parasite was also resistant to the partner drug. Thus, to slow the spread of partial artemisinin resistance, molecular surveillance should be supported to detect resistance to partner drugs and to change ACTs accordingly. Furthermore, implementing more sustainable artemisinin-based therapies will require extending parasite exposure to artemisinin derivatives, and mitigating the selection windows of partner drugs, which could be achieved by including an additional long-acting drug.</p> </section> <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="introduction">Introduction </h2> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Malaria remains a global health priority <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib103"><span>103</span><span>WHO</span><span>2020</span></a></cite>. The WHO recommends several artemisinin-based combination therapies (ACTs) to treat uncomplicated <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">Plasmodium falciparum</em> malaria <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. ACTs combine a short-acting artemisinin derivative to rapidly reduce parasitaemia during the first 3 days of treatment and a long-acting partner drug to eliminate remaining parasites <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. These drug combinations are intended to delay the evolution of drug resistance, which has frequently occurred under monotherapy treatment <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib27"><span>27</span><span>Farooq and Mahajan</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib99"><span>99</span><span>White</span><span>1999</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib100"><span>100</span><span>White</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib109"><span>109</span><span>Wongsrichanalai et al.</span><span>2002</span></a></cite></span>. However, parasites partially resistant to artemisinin have emerged in the Greater Mekong Subregion (GMS) and, more recently, in Rwanda, Uganda, Guyana, and Papua New Guinea despite the use of ACTs <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib14"><span>14</span><span>Chenet et al.</span><span>2016</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib92"><span>92</span><span>Uwimana et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib93"><span>93</span><span>Uwimana et al.</span><span>2021</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib68"><span>68</span><span>Miotto et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib4"><span>4</span><span>Balikagala et al.</span><span>2021</span></a></cite></span>. Partial artemisinin resistance leads to slower parasite clearance following treatment with ACTs, but not necessarily to treatment failure <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. However, high rates of treatment failure have been observed in the GMS due to parasites being less sensitive to artemisinin derivatives and their partner drugs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. To prevent the evolution of drug-resistant parasites and to preserve the efficacy of ACTs or triple artemisinin-based combination therapies (TACT, including a second long-acting drug) now being tested <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib94"><span>94</span><span>Pluijm et al.</span><span>2020</span></a></cite>, it is essential to understand which factors drive this process.</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The evolution of drug resistance follows a three-step process of mutation, establishment, and spread. First, mutations conferring drug resistance emerge in the population at a rate that depends on multiple factors, such as organism mutation and migration rates <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib62"><span>62</span><span>Mackinnon</span><span>2005</span></a></cite></span>. Second, establishment is a highly stochastic step as the parasite with the drug-resistant mutation needs to infect other hosts <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib62"><span>62</span><span>Mackinnon</span><span>2005</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite></span>. The resistant strain establishes in the population once its frequency is high enough to minimise its risk of stochastic extinction <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib62"><span>62</span><span>Mackinnon</span><span>2005</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite></span>. Several forces influence the establishment of mutations. In settings with higher heterogeneity of parasite reproductive success, establishment of mutations is less likely because the effects of stochasticity are more substantial <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Hastings and Mackinnon</span><span>1998</span></a></cite></span>. This heterogeneity depends on the level of transmission and health system strength <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Hastings and Mackinnon</span><span>1998</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib51"><span>51</span><span>Klein</span><span>2014</span></a></cite></span>. In addition, the more selection favours the resistant strain, the more likely it is to establish <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Hastings and Mackinnon</span><span>1998</span></a></cite></span>. The strength of selection depends on many factors, such as the parasite and human biology, the transmission setting, drug properties, and health system strength <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib100"><span>100</span><span>White</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib2"><span>2</span><span>Antao and Hastings</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib41"><span>41</span><span>Hughes and Andersson</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib42"><span>42</span><span>Huijben et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib67"><span>67</span><span>Miotto et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib80"><span>80</span><span>Slater et al.</span><span>2017</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib63"><span>63</span><span>Mackinnon and Marsh</span><span>2010</span></a></cite></span>. Third, resistance spreads through a region after a resistant mutation has become established. The mutation spreads at a rate that depends on the strength of selection <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite></span>.</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">It is not fully understood how factors intrinsic to the transmission setting, health system, human and parasite biology, and drug properties interact to influence the establishment and spread of drug-resistant parasites. Mathematical models of infectious disease have not previously been used to systematically assess the joint influence of multiple factors on the establishment and spread of drug-resistant <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P. falciparum</em> (e.g. <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib51"><span>51</span><span>Klein</span><span>2014</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib80"><span>80</span><span>Slater et al.</span><span>2017</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib9"><span>9</span><span>Bushman et al.</span><span>2018</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib102"><span>102</span><span>Whitlock et al.</span><span>2021</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Hastings et al.</span><span>2002</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib97"><span>97</span><span>Watson et al.</span><span>2021</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib7"><span>7</span><span>Brock et al.</span><span>2018</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib96"><span>96</span><span>Watkins and Mosobo</span><span>1993</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib72"><span>72</span><span>Pongtavornpinyo et al.</span><span>2008</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib101"><span>101</span><span>White et al.</span><span>2009</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib17"><span>17</span><span>Chiyaka et al.</span><span>2009</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib26"><span>26</span><span>Esteva et al.</span><span>2009</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib53"><span>53</span><span>Koella and Antia</span><span>2003</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib56"><span>56</span><span>Lee and Penny</span><span>2019</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib57"><span>57</span><span>Lee et al.</span><span>2022</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib58"><span>58</span><span>Legros and Bonhoeffer</span><span>2016</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib88"><span>88</span><span>Tchuenche et al.</span><span>2011</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib91"><span>91</span><span>Tumwiine et al.</span><span>2007</span></a></cite>) (and to the best of our knowledge other drug-resistant pathogens [virus, bacteria, etc.]). Simple models, based on the Ross and MacDonald model <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib61"><span>61</span><span>Macdonald</span><span>1957</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib74"><span>74</span><span>Ross</span><span>1915</span></a></cite></span>, have considered specific components of the epidemiology of resistance and, therefore, are not sophisticated enough to answer questions on how factors have jointly impacted establishment and spread of drug resistance <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib7"><span>7</span><span>Brock et al.</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib17"><span>17</span><span>Chiyaka et al.</span><span>2009</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib26"><span>26</span><span>Esteva et al.</span><span>2009</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib53"><span>53</span><span>Koella and Antia</span><span>2003</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib56"><span>56</span><span>Lee and Penny</span><span>2019</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib88"><span>88</span><span>Tchuenche et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib91"><span>91</span><span>Tumwiine et al.</span><span>2007</span></a></cite></span>. Most models have investigated specific transmission scenarios and questions, such as how within-host competition between parasites influences development of drug resistance <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib9"><span>9</span><span>Bushman et al.</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib72"><span>72</span><span>Pongtavornpinyo et al.</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib58"><span>58</span><span>Legros and Bonhoeffer</span><span>2016</span></a></cite></span>, and did not systematically assess the impact of assumptions used on their results. Consequently, previous studies have neither systematically compared the influence of multiple drivers, nor assessed how their influence varies under different transmission settings or health system strengths.</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In addition, most models have made simplifications concerning drug action and consequences of partial resistance. They have typically not explicitly modelled the pharmacokinetics and pharmacodynamics of the drugs and have assumed that resistant parasites are fully resistant to the drugs. Parasites partially resistant to artemisinin exhibit an extended ring-stage during which they are not sensitive to artemisinin; however, parasites remain sensitive to artemisinin during other stages <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib52"><span>52</span><span>Klonis et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib95"><span>95</span><span>Wang et al.</span><span>2017</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib78"><span>78</span><span>Sá</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib107"><span>107</span><span>Witkowski et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib112"><span>112</span><span>Ye et al.</span><span>2016</span></a></cite></span>. In addition, parasites resistant to partner drugs have an increased minimum inhibitory concentration (MIC), meaning that they are not sensitive to low drug concentrations but remain susceptible to high concentrations of partner drugs <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib11"><span>11</span><span>Chaorattanakawee et al.</span><span>2016</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib10"><span>10</span><span>Chaorattanakawee et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib87"><span>87</span><span>Tahita et al.</span><span>2015</span></a></cite></span>. Consequently, many models have ignored the residual effect of drugs on resistant parasites and have not investigated the influence of the degree of resistance and drug proprieties on the establishment and spread of drug resistance. Models that have explicitly considered drug action have focused on specific questions such as how half-life impacts the spread of resistance or how resistance to the partner drug influences evolution of artemisinin resistance <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Hastings et al.</span><span>2002</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib97"><span>97</span><span>Watson et al.</span><span>2021</span></a></cite></span>. However, they did not investigate how the impact of drug proprieties and the degree of resistance interact with other biological, transmission, and health system factors.</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In this study, we developed a disease model with an emulator-based approach to quantify the influence of factors intrinsic to the biology of the parasite and human, the transmission setting, the health system strength, and the drug properties on the establishment and spread of drug-resistant parasites. Our approach is based on a detailed individual-based malaria model, OpenMalaria (<a href="https://github.com/SwissTPH/openmalaria/wiki" itemscope="" itemtype="http://schema.stenci.la/Link">https://github.com/SwissTPH/openmalaria/wiki</a>), that includes a mechanistic within-host model (based on <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib70"><span>70</span><span>Molineaux et al.</span><span>2002</span></a></cite>). We first adapted our model, OpenMalaria, to explicitly include mechanistic drug action models at the individual level (as a one, two, or three-compartment pharmacokinetic model with a pharmacodynamics component of parasite killing <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Bertrand and Mentré</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib43"><span>43</span><span>Johnston et al.</span><span>2014</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite></span>) and to track multiple parasite genotypes to which we could assign fitness costs and drug susceptibility (i.e. pharmacodynamics) properties. We then built an emulator-based workflow to quantify, through a series of global sensitivity analyses, the influence of multiple factors on the establishment and spread of parasites having different degrees of resistance to artemisinin derivatives and/or their partner drugs when used in monotherapy and combination (as ACTs). Emulators are predictive models that can approximate the relationship between input and output parameters of complex models and can run much faster than complex models to perform global sensitivity analyses more efficiently <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib30"><span>30</span><span>Grow and Hilton</span><span>2018</span></a></cite>. OpenMalaria is a mechanistic model, so the observed dynamics at the population level (e.g. the spread of resistant genotypes) emerges from the relationship between the different model components and their input parameters. These dynamics can only be understood and tested through extensive analyses as undertaken here. Identifying which factors (e.g. drug properties and/or setting characteristics) favour the evolution of resistance, enables us to identify drug properties or strategies to slow or mitigate resistance and guides the development and implementation of more sustainable therapies.</p> <h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="results">Results</h2> <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="development-of-drug-resistance">Development of drug resistance</h3> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We investigated the establishment and spread of drug-resistant genotypes by varying the degrees of resistance for three different treatment profiles. The first treatment profile considered was a monotherapy using a short-acting drug. The short-acting drug had a short half-life and a high killing efficacy typical of artemisinin derivatives (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1A and B</a>). Patients received a daily dose of the short-acting drug for 6 days (see Materials and methods). To mimic the mechanism of resistance to artemisinin derivatives, we assumed that genotypes resistant to the short-acting drug had lower maximum killing rates (Emax) than sensitive ones (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1B</a>) (see Materials and methods). We defined the degree of resistance to the short-acting drug as the relative decrease of the Emax of the resistant genotype compared with the sensitive one. The second treatment profile was also a monotherapy but with a long-acting drug. The long-acting drug had a longer half-life and a lower Emax than the short-acting drug, typical of partner drugs used for ACTs (such as mefloquine, piperaquine, and lumefantrine) (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1A and B</a>). Patients received a daily dose of the long-acting drug for 3 days (see Materials and methods). We assumed that genotypes resistant to the long-acting drug had higher half-maximal effective concentrations (EC50) than sensitive ones (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1B</a>) (see Materials and methods). We defined the degree of resistance to the long-acting drug as the relative increase of the EC50 of the resistant genotype compared with the sensitive genotype. Note that monotherapies for malaria are no longer recommended, but we investigated drivers of resistance under monotherapy to identify the determinants specific to each drug profile. The last treatment profile was a daily dose of a combination of the short-acting and the long-acting drugs for 3 days, simulating ACTs. In this case, we focused on resistance to the short-acting drug, as artemisinin is the shared compound of all ACTs and is of greater concern. Thus, the resistant and sensitive genotypes refer to sensitivity to the short-acting drug. We measured selection for resistance to the short-acting drug against a background of differing sensitivity to the long-acting partner drug, whose effectiveness was varied as described in <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>. We assumed that the genotypes sensitive and resistant to the short-acting drug had identical sensitivities to the partner drug (i.e. there was no cross-resistance).</p> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig1" title="Figure 1."> <label data-itemprop="label">Figure 1.</label><img src="index.html.media/fig1.jpg" alt="" itemscope="" itemtype="http://schema.org/ImageObject"> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="overview-of-treatment-profiles-and-the-modelling-workflow">Overview of treatment profiles and the modelling workflow.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">(<strong itemscope="" itemtype="http://schema.stenci.la/Strong">A</strong>) Examples of the modelled within-host concentration (mg/l) of both the short- and long-acting drugs used as monotherapy. Here, patients received a daily dose of the short-acting drug for 6 days or a daily dose of the long-acting drug for 3 days. The grey shaded area represents an exemplar selection window (defined as the period of time post-treatment when drug concentration is sufficiently high to prevent reinfection by drug-sensitive infections but is sufficiently low to allow reinfection by drug-resistant infections). The short- and long-acting drugs used in combination (like ACTs) had the same respective profile as in monotherapy, but patients received a daily dosage of each drug over 3 days, as recommended by WHO for ACTs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib105"><span>105</span><span>WHO</span><span>2021</span></a></cite>. (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">B</strong>) Illustrations of the modelled relationship between the concentration (log[mg/l]) and the killing effect (per day) of the short- and long-acting drugs on the resistant (brown dashed curve) and sensitive genotypes (solid blue curve). Compared with sensitive genotypes, resistant parasites had a reduced maximum killing rate (Emax) when resistant to the short-acting drug and an increased half-maximal effective concentration (EC50) when resistant to the long-acting drug. (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">C</strong>) Schematic of the modelling workflow: central plot, brown curve represents an exemplar frequency of the resistant genotype in infected humans. The purple area (right side) shows the steps for assessing the influence of factors on the rate of spread (selection coefficient) of a resistant genotype through global sensitivity analysis of an emulator trained on our model simulations (see Materials and methods). In brief: (i) randomly sampling combinations of parameters, (ii) assessing the rate of spread of the resistant genotype for each parameter combination, (iii) training an emulator to learn the relationship between the input (for the different drivers) and output (the rate of spread) with iterative improvements to fitting through adaptive sampling, (iv) performing the global sensitivity using the trained emulator. The global sensitivity analysis estimates both first-order indices of each factor (representing their influence on the rate of spread) and the 25th, 50th, and 75th quantiles of the estimated selection coefficient from the emulator across each parameter range. The orange area (left side) shows the steps to assess the relationship between the selection coefficient and the probability of establishment in different transmission settings (see Materials and methods). In brief: (v) selecting genotypes with different selection coefficients in each setting, (vi) assessing their probability of establishment, and (vii) visualising the relationship between the probability of establishment and the section coefficient in each setting. HGP: Heteroskedastic Gaussian Process.</p> </figcaption> </figure> <table id="table1" itemscope="" itemtype="http://schema.org/Table"> <caption><label data-itemprop="label">Table 1.</label> <div itemprop="caption"> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="potential-drivers-of-the-spread-of-drug-resistance">Potential drivers of the spread of drug resistance.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">List of factors and their parameter ranges investigated in the global sensitivity analyses of the spread of parasites resistant to each treatment profile. The parameter ranges were defined based on the literature as described in Materials and methods. Note that the parameter ranges of the short-acting drug captured the parameter values of typical artemisinin derivatives, and the parameter ranges of the long-acting drug captured the parameter values of partner drugs of artemisinin derivatives such as mefloquine, piperaquine, and lumefantrine. In addition, note that the ratio maximum drug concentration/half-maximal effective concentration (Cmax/EC50) is not a direct input of the model, but we varied this ratio by varying the EC50 of the sensitive genotype and the drug dosage (which impacted Cmax). We initially assessed the effect of Cmax and EC50 on the rate of spread independently; however, we found that the impact of the EC50 and the Cmax on the drug killing effect post-treatment depended on their ratio (see Materials and methods). A Latin hypercube sampling (LHS) algorithm was used to sample from the ranges of all parameters <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib29"><span>29</span><span>Gramacy</span><span>2007</span></a></cite>. </p> </div> </caption> <thead> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Component</th> <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Determinant</th> <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Definition</th> <th itemscope="" itemtype="http://schema.stenci.la/TableCell">Parameter range(References)</th> <th itemscope="" itemtype="http://schema.stenci.la/TableCell"></th> </tr> </thead> <tbody> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Short-acting drug</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Long-acting drug</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><strong itemscope="" itemtype="http://schema.stenci.la/Strong">Drug properties (PK/PD model</strong>) </td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Half-life</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Time for the drug concentration to fall by 50% (days)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(0.035, 0.175)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(6, 22)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib12"><span>12</span><span>Charles et al.</span><span>2007</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib85"><span>85</span><span>Staehli Hodel et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib44"><span>44</span><span>Jullien et al.</span><span>2014</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib45"><span>45</span><span>Karunajeewa et al.</span><span>2008</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib64"><span>64</span><span>Maganda et al.</span><span>2015</span></a></cite>)</td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Emax</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Maximum killing rate the drug can achieve (per day)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(27.5, 31.0) (<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(3.45, 5.00)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Cmax/EC50</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">The ratio between the maximum drug concentration (Cmax) and the half-maximal effective concentrations (EC50) of the sensitive genotype. This calculated ratio captures the duration of the drug killing effect by capturing how high the Cmax is compared to the EC50</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(55.0–312.0)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(5.1–21.7)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><strong itemscope="" itemtype="http://schema.stenci.la/Strong">Parasite biology</strong></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Degree of resistance (PK<strong itemscope="" itemtype="http://schema.stenci.la/Strong">/</strong>PD model)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">For the short-acting drug: relative decrease of the Emax of the resistant genotype compared with the sensitive oneFor the long-acting drug: relative increase of the EC50 of the resistant genotype compared with the sensitive one (see Materials and methods)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(1, 50)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(1, 20)</td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Fitness cost</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Relative reduction of the resistant genotype multiplication rate within the human host compared to the sensitive one</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(1.0, 1.1)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib55"><span>55</span><span>Kublin et al.</span><span>2003</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib69"><span>69</span><span>Mita et al.</span><span>2003</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><strong itemscope="" itemtype="http://schema.stenci.la/Strong">Transmission level</strong></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Entomological inoculation rate</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Mean number of infective mosquito bites received by an individual during a year (inoculations per person per year)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(5, 500)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib22"><span>22</span><span>Edwards et al.</span><span>2019</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib39"><span>39</span><span>Hay et al.</span><span>2000</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib13"><span>13</span><span>Chaumeau et al.</span><span>2018</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib23"><span>23</span><span>Edwards et al.</span><span>2019</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib111"><span>111</span><span>Yamba et al.</span><span>2020</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"><strong itemscope="" itemtype="http://schema.stenci.la/Strong">Health system</strong></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Level of access to treatment</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">The probability of symptomatic cases to receive treatment within two weeks from the onset of symptom onset (%)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(10, 80)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> <tr itemscope="" itemtype="http://schema.stenci.la/TableRow"> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Diagnostic detection limit</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">Parasite density for which the probability of having a positive diagnostic test is 50% (parasites/μl) </td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell">(2, 50)(<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib50"><span>50</span><span>Kilian et al.</span><span>2000</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib71"><span>71</span><span>Murray et al.</span><span>2008</span></a></cite>)</td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> <td itemscope="" itemtype="http://schema.stenci.la/TableCell"></td> </tr> </tbody> </table> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our analysis had two steps. First, we quantified the impact of factors listed in <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a> on the spread of drug-resistant parasites through global sensitivity analyses using an emulator trained on our model simulations (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1C</a>, purple area [right side], see Materials and methods). For each simulation, we tracked a drug-sensitive genotype and a drug-resistant genotype, and we estimated the rate of spread using the selection coefficient, which measures the rate at which the logit of the resistant genotype frequency increases each parasite generation (see Materials and methods, note that a selection coefficient below zero implies that resistance does not spread in the population) <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>. Then, we assessed the probability of establishment for a subset of resistant genotypes with known and positive selection coefficients to observe the relationship between selection coefficient and the probability of establishment in different settings (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1C</a>, orange area [left side], see Materials and methods). We could then extrapolate the probability of establishing any mutations with a known selection coefficient, which made the process more efficient since estimating the probability of establishment requires running many more stochastic realisations than estimating the selection coefficient due to the stochasticity of this step.</p> <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="key-drivers-of-the-spread-of-drug-resistant-parasites">Key drivers of the spread of drug-resistant parasites</h3> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Under monotherapy, access to treatment (the probability of symptomatic cases to receive treatment within 2 weeks from the onset of symptoms) and degree of resistance of a monotherapy were the main drivers of the spread of resistance (<a href="#fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2A</a>). For the short-acting and the long-acting drugs used as monotherapy, the selection coefficient increased with increasing access to treatment (<a href="#fig2s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2—figure supplement 1</a>). In addition, higher degrees of resistance of the resistant genotype to the short-acting drug (relative decrease in the resistant genotype Emax compared with the sensitive one) and the long-acting drug (relative increase in the resistant genotype EC50 compared with the sensitive one) promoted the spread of parasites resistant to the short-acting and the long-acting drugs, respectively (<a href="#fig2s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2—figure supplement 1</a>).</p> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig2" title="Figure 2."> <label data-itemprop="label">Figure 2.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code>#library("ggh4x") library("ggplot2") library("gridExtra") library("cowplot") ### Figure 2A #### # load the data data <- read.csv(file = "data/Figure2-Sourcedata1.csv", header = TRUE) # Order the level of the factors (in the order of the highest sobol indices to lower one) data$Factor <- factor(data$Factor, levels = c( "Diangostic", "Maximum killing rate of drug A", "Maximum killing rate of drug B", "EIR", "Cmax/IC50 of drug A", "Cmax/IC50 of drug B", "Half-life of drug A", "Half-life of drug B", "Fitness", "Resistance level of drug A", "Resistance level of drug B", "Access" )) # Make drug variable as a factor for visualisation data$drug <- factor(data$drug, levels = c("Drug A", "Drug B", "Drug A + Drug B")) # Select only the non-seasonal setting data_2 <- data[data$Setting == "Spread_sesonality1", ] # define the break for the sobol indices on the y values break_y <- c(0, 0.25, 0.5, 0.75, 1) Label_yy <- c(0, 0.25, 0.5, 0.75, 1) # Define the label for each drug archetype Dr.labs <- c("Drug A", "Drug B", "Drug A + B") names(Dr.labs) <- c("A", "B", "A+B") # select only the first order indicies data_3 <- data_2[data_2$Effect == "First", ] constant<-2 # visualise as a columns PA <- ggplot(data_3, aes(x = drug, y = First, fill = Factor)) + geom_col(color = "black", width = 0.6) + xlab("") + ylab("First-order indices") + scale_fill_manual( values = c( "#126429", "#5087C1", "#273871", "#999933", "#E6959F", "#AA4499", "#88CCEE", "#009E73", "#DDCC77", "#882255", "#661100", "#888888"), name = "Factors:", breaks = c("Access", "Resistance level of drug A", "Resistance level of drug B", "Fitness", "Half-life of drug A", "Half-life ofdrug B", "Cmax/IC50 of drug A", "Cmax/IC50 of drug B", "EIR", "Maximum killing rate of drug A", "Maximum killing rate of drug B", "Diangostic"), labels = c("Access to treatment (%)", "Degree of resistance to\nthe short-acting drug", "Degree of resistance to\nthe long-acting drug", "Fitness cost", "Half-life of the\nshort-acting drug (days)", "Half-life of the\nlong-acting drug (days)", "Cmax/EC50 of the\nshort-acting drug", "Cmax/EC50 of the\nlong-acting drug", "EIR (inoculations per person per year)", "Emax of the\nshort-acting drug (per day)", "Emax of the\nlong-acting drug (per day)", "Diagnostic detection limit\n(parasites/microliter)")) + scale_x_discrete(labels = c("Drug A" = "Short-acting\ndrug", "Drug B" = "Long-acting\ndrug", "Drug A + Drug B" = "Short-acting + \nLong-acting drugs")) + theme_bw() + theme( axis.text.x = element_text(size = 15/constant, colour = "black"), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 15/constant, face = "bold"), axis.title.y = element_text(size = 15/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 15/constant)) + theme(legend.title = element_text(size = 15/constant, face = "bold")) + ggtitle(label = "")+ theme(legend.key.size = unit(0.3, "cm")) ### Figure 2B #### # Load the data Quantil_final_final <- read.csv(file = "data/Figure2-Sourcedata2.csv", header = TRUE) Quantil_final_final <- Quantil_final_final[, c(1:5, 10)] # add data about the drug archeytpe Quantil_final_final$Drug <- "Short-acting + Long-acting drugs" # Define the break for the y axis break_y <- c(1, 10, 20, 30, 39) Label_yy <- c("Min", "", "", "", "Max") #---- visualise three most important factor in the non seasonal setting ---- # select the data Quantil_final_2 <- Quantil_final_final[Quantil_final_final$Seasonality == "sesonality1", ] Quantil_final_2 <- Quantil_final_2[Quantil_final_2$G == "Access" | Quantil_final_2$G == "Resistance_Level_long" | Quantil_final_2$G == "Resistance_Level", ] constant<-2 # visualise PB <- ggplot(data = Quantil_final_2) + geom_line(aes(x = x, y = M, color = G), size = 2/constant) + geom_ribbon(aes(x = x, ymin = L, ymax = U, fill = G), alpha = 0.1) + facet_grid(. ~ Drug) + theme_bw() + scale_y_continuous(name = "Selection coefficient\n(resistance to the short-acting drug)") + scale_x_continuous(name = "Factor values", breaks = break_y, labels = Label_yy) + scale_color_manual( name = "Factors:", values = c( "#126429", "#709FCD", "#273871"), breaks = c("Access", "Resistance_Level", "Resistance_Level_long", "half_life_long", "Fitness", "eir", "half_life_short", "C_max_IC50"), labels = c("Access to treatment (%)", "Degree of resistance to the short-acting drug", "Degree of resistance to the long-acting drug", "\nHalf-life\nof drug B", "Fitness cost", "EIR", "\nHalf-life\nof drug A", "Cmax/IC50\nof drug B")) + scale_fill_manual( name = "Factors:", values = c( "#117733", "#6699CC", "#332288"), breaks = c("Access", "Resistance_Level", "Resistance_Level_long", "half_life_long", "Fitness", "eir", "half_life_short", "C_max_IC50"), labels = c("Access to treatment (%)", "Degree of resistance to the short-acting drug", "Degree of resistance to the long-acting drug", "\nHalf-life\nof drug B", "Fitness cost", "EIR", "\nHalf-life\nof drug A", "Cmax/IC50\nof drug B")) + theme( axis.text.x = element_text(size = 15/2), axis.text.y = element_text(size = 15/2), axis.title.x = element_text(size = 15/2, face = "bold"), axis.title.y = element_text(size = 15/2, face = "bold"), plot.title = element_text(size = 20/2, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 15/2)) + theme(legend.title = element_text(size = 15/2, face = "bold")) + theme( strip.text.x = element_text(size = 15/2, color = "black", face = "bold"), strip.text.y = element_text(size = 15/2, color = "black", face = "bold")) + # theme(legend.position = "bottom", legend.direction = "vertical")+ theme(legend.key.size = unit(0.3, "cm")) grid.arrange(PA,PB)</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="influence-of-drug-properties-fitness-costs-degrees-of-resistance-transmission-levels-and-health-system-factors-on-estimated-selection-coefficients-for-three-treatment-profiles"> Influence of drug properties, fitness costs, degrees of resistance, transmission levels, and health system factors on estimated selection coefficients for three treatment profiles.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">(<strong itemscope="" itemtype="http://schema.stenci.la/Strong">A</strong>) The first-order indices from our variance decomposition analysis indicate the level of importance of drug properties, fitness costs, degrees of resistance, transmission levels, access to treatment, and diagnostic limits in determining the spread of drug resistance. Indices are shown for each treatment profile in a non-seasonal setting with a population fully adherent to treatment. Selection coefficients are considered for the short-acting drug and the long-acting drug when each drug is used as monotherapy and for the short-acting drug when both drugs are used in combination. Definitions and ranges of parameters investigated are listed in <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>. (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">B</strong>) Influence of factors on the selection coefficient of genotypes resistant to the short-acting drug in a population that used the short-acting and the long-acting drugs in combination. Curves and shaded areas represent the median and interquartile range of selection coefficients estimated during the global sensitivity analyses over the following parameter ranges: access to treatment (10–80%); the degree of resistance of the resistant genotype to the short-acting drug (1–50-fold reduction in Emax); and the degree of resistance of both sensitive and resistant genotypes to the long-acting drug (1–20-fold increase in EC50). A selection coefficient below zero implies that resistance does not spread in the population but is being lost due to its fitness costs. The transmission setting was non-seasonal and all treated individuals were fully adherent to treatment.</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig2s1" title="Figure 2—figure supplement 1."><label data-itemprop="label">Figure 2—figure supplement 1.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Load the data Quantil_final_final <- read.csv(file = "data/Figure2-figuresupplement1-Sourcedata1.csv", sep = ",", header = T) # select non seasonal setting Quantil_final_2 <- Quantil_final_final[Quantil_final_final$Seasonality == "sesonality1",] # select factor of interest Quantil_final_2 <- Quantil_final_2[Quantil_final_2$G == "Access" | Quantil_final_2$G == "Resistance level of drug B" | Quantil_final_2$G == "Resistance level of drug A",] # Define a label for lower value of each factor and one for highest value break_y <- c(1, 10, 20, 30, 39) Label_yy <- c("Min", "", "", "", "Max") # Define label for each drug type Dr.labs <- c("Short-acting drug", "Long-acting drug") names(Dr.labs) <- c("Drug A", "Drug B") constant<-2 # Visualise the results ggplot(data = Quantil_final_2) + geom_line(aes(x = x, y = M, color = G), size = 2/constant) + geom_ribbon(aes( x = x, ymin = L, ymax = U, fill = G) , alpha = 0.15) + facet_grid(. ~ drug, labeller = labeller(drug = Dr.labs)) + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient") + scale_x_continuous(name = "Factor values", breaks = break_y, labels = Label_yy) + theme( axis.text.x = element_text(size = 16/constant), axis.text.y = element_text(size = 16/constant), axis.title.x = element_text(size = 18/constant, face = "bold"), axis.title.y = element_text(size = 18/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 18/constant)) + theme(legend.title = element_text(size = 18/constant, face = "bold")) + scale_color_manual( name = "Factors:", values = c("#126429", "#709FCD", "#273871"), breaks = c( "Access", "Resistance level of drug A", "Resistance level of drug B", "half_life", "Fitness", "eir", "C_max_IC50"), labels = c( "Access to treatment (%)", "Degree of resistance to the short-acting drug", "Degree of resistance to the long-acting drug", "Half-life", "Fitness cost", "EIR", "Cmax/IC50")) + scale_fill_manual( name = "Factors:", values = c("#117733", "#6699CC", "#332288"), breaks = c( "Access", "Resistance level of drug A", "Resistance level of drug B", "half_life", "Fitness", "eir", "C_max_IC50"), labels = c( "Access to treatment (%)", "Degree of resistance to the short-acting drug", "Degree of resistance to the long-acting drug", "Half-life", "Fitness cost", "EIR", "Cmax/IC50")) + ggtitle(label = "") + theme( strip.text.x = element_text(size = 18/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 18/constant, color = "black", face = "bold"))+ theme(legend.position = "bottom", legend.direction = "vertical")+ theme(legend.key.size = unit(1/constant, "cm")) </code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="influence-of-the-access-to-treatment-and-degree-of-resistance-on-the-estimated-selection-coefficients-of-a-genotype-resistant-to-the-short-acting-drug-or-the-long-acting-drug-used-in-monotherapy"> Influence of the access to treatment and degree of resistance on the estimated selection coefficients of a genotype resistant to the short-acting drug or the long-acting drug used in monotherapy.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Lines represent medians and shaded areas represent interquartile ranges of the selection coefficients estimated during the global sensitivity analysis over the parameter range for levels of access to treatment (10–80%), the degree of resistance to the short-acting drug (1–50-fold decrease in Emax), and the degree of resistance to the long-acting drug (1–20-fold increase in EC50).</p> </figcaption> </figure> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">When the short-acting and the long-acting drugs were used in combination in our model, we referred to the resistant and sensitive genotypes as the genotypes resistant and sensitive to the short-acting drug, respectively. However, both genotypes could have some degree of resistance to the long-acting drug. In this case, the most important driver of spread was the degree of resistance of both genotypes to the long-acting drug (<a href="#fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2A</a>). The median selection coefficient was below zero when both genotypes were susceptible to the long-acting drug (the minimum degree of resistance to the long-acting drug) (<a href="#fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 2B</a>), indicating that using an efficient partner drug can limit the spread of artemisinin resistance. The spread of parasites resistant to the short-acting drug was accelerated when parasites were also resistant to the long-acting drug, highlighting that resistance to the long-acting drug can facilitate the spread of artemisinin resistance. We further illustrated with concrete examples (Appendix: section 1.1) how the spread of partial resistance to the short-acting drug accelerates with higher degrees of resistance to the long-acting drug. These results further confirmed that resistance to partner drugs facilitates the spread of resistance to artemisinin, highlighting the importance of combining artemisinin derivatives with an efficient partner drug.</p> <h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="variation-in-the-influence-of-factors-across-settings-and-degrees-of-resistance"> Variation in the influence of factors across settings and degrees of resistance</h3> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We compared the effects of drug properties and levels of fitness cost on estimated selection coefficients for a fixed set of degrees of resistance, levels of access to treatment, transmission intensities, seasonality patterns, and levels of adherence to treatment (percentage of treatment doses adhered by patients). <a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a> summarises the impact of key factors influencing estimated selection coefficients in seasonal transmission settings with a population fully adherent to treatment (the impact of factors was similar across seasonality pattern and levels of adherence to treatment <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 1</a>–<a href="#fig3s2" itemscope="" itemtype="http://schema.stenci.la/Link">!number(2)</a>). The impact of all factors in each setting is shown in <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 1</a>–<a href="#fig3s2" itemscope="" itemtype="http://schema.stenci.la/Link">!number(2)</a>.</p> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3" title="Figure 3."> <label data-itemprop="label">Figure 3.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># load the data and add the drug name Quantil_final_final<-read.csv(file = "data/Figure3-Sourcedata1.csv", sep = ",", header = T) # Transform constrained variable into a factor Quantil_final_final$drug <- factor(Quantil_final_final$drug, levels = c("A", "B", "A+B")) Quantil_final_final$Dosage <- factor(Quantil_final_final$Dosage, levels = c("1", "0")) Quantil_final_final$EIR <- factor(Quantil_final_final$EIR, levels = c("5", "10", "500")) # Creat a label for each constrained variable S.labs <- c("No seasonality", "Seasonality") names(S.labs) <- c("sesonality1", "sesonality2") T.labs <- c("Low access to treatment", "High access to treatment") names(T.labs) <- c("0.04", "0.5") D.labs <- c("High adherence\n to treatment", "Low adherence\n to treatment") names(D.labs) <- c("1", "0") Dr.labs <- c("Short-acting\ndrug", "Long-acting\ndrug", "Short-acting +\n Long-acting drugs") names(Dr.labs) <- c("A", "B", "A+B") Dr.labs_2 <- c("", "", "") names(Dr.labs_2) <- c("A", "B", "A+B") R.labs <- c("Low degree\n of resistance", "Low degree\n of resistance", "High degree\n of resistance", "High degree\n of resistance") names(R.labs) <- c("7", "2.5", "18", "10") R.labs_2 <- c("", "", "", "") names(R.labs_2) <- c("7", "2.5", "18", "10") # creat the label for the y axis break_y <- c(1, 10, 20, 30, 39) Label_yy <- c("Min", "", "", "", "Max") # select the data Quantil_final_2 <- Quantil_final_final[Quantil_final_final$G == "Fitness" | Quantil_final_final$G == "half_life_short" | Quantil_final_final$G == "C_max_IC50_short" | Quantil_final_final$G == "half_life_long" | Quantil_final_final$G == "C_max_IC50_long", ] Quantil_final_3 <- Quantil_final_2[Quantil_final_2$EIR == 500 | Quantil_final_2$EIR == 5, ] Quantil_final_3 <- Quantil_final_3 #Quantil_final_3 <- Quantil_final_3[Quantil_final_3$Access == 0.5 & Quantil_final_3$Seasonality == "sesonality1" | Quantil_final_3$Access == 0.04 & Quantil_final_3$Dosage == 1 & Quantil_final_3$Seasonality == "sesonality1" | Quantil_final_3$Access == 0.5 & Quantil_final_3$Dosage == 1 & Quantil_final_3$Seasonality == "sesonality2", ] #Quantil_final_3 <- Quantil_final_3[Quantil_final_3$Resistance_level == 2.5 | Quantil_final_3$Resistance_level == 7, ] Quantil_final_3$x[Quantil_final_3$G == "Fitness"] <- (Quantil_final_3$x[Quantil_final_3$G == "Fitness"] - 40) * -1 Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A"] <- (Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A"] - 40) * -1 Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A+B"] <- (Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A+B"] - 40) * -1 Quantil_final_4 <- Quantil_final_3[Quantil_final_3$Seasonality == "sesonality2", ] Quantil_final_4 <- Quantil_final_4[Quantil_final_4$Dosage == 1, ] Quantil_final_4<-Quantil_final_4[Quantil_final_4$G=="half_life_short" | Quantil_final_4$G=="Fitness" |Quantil_final_4$G=="C_max_IC50_long" |Quantil_final_4$G=="half_life_long",] Quantil_final_4$G<-as.factor(Quantil_final_4$G) # Do the plot for drug A Quantil_final_4_1 <- Quantil_final_4[Quantil_final_4$drug == "A", ] Quantil_final_4_1<-Quantil_final_4_1[Quantil_final_4_1$G=="half_life_short" & Quantil_final_4_1$Access==0.5 | Quantil_final_4_1$G=="Fitness" & Quantil_final_4_1$Access==0.04,] break_y <- c(1, 10, 20, 30, 39) Label_y <- c("Min", "", "", "", "Max") Label_yy_1 <- c("", "", "", "", "") constant<-2.5 pl11 <- ggplot(data = Quantil_final_4_1) + geom_line(aes(x = x, y = M, color = G, linetype = EIR), size = 1.9/constant, alpha = 1) + # facet_nested(drug~Access+Seasonality+Dosage,labeller=labeller(drug= Dr.labs,Access=T.labs, Dosage=D.labs, Seasonality=S.labs,Resistance_level=R.labs)) + facet_nested(drug ~ Access + Resistance_level, labeller = labeller(drug = Dr.labs, Access = T.labs, Dosage = D.labs, Seasonality = S.labs, Resistance_level = R.labs), scales = "free", independent = "x") + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient",limits=c(-0.125,0.6)) + scale_x_continuous(name = "",breaks = break_y, labels = Label_y) + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x =element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 12/constant)) + theme(legend.title = element_text(size = 12/constant, face = "bold")) + theme(legend.margin = margin(0,0,0,0, unit="cm"))+ guides( linetype = guide_legend(keywidth = 5/constant, keyheight = 0.05/constant, override.aes = list(size = 2.5/constant)), colour = guide_legend(keywidth = 2/constant, keyheight = 0.05/constant, override.aes = list(size = 5/constant)), legend.spacing.y = unit(-1500, "cm")) + scale_color_manual( name = "Factors:", values = c( "#999933", "#CC6677", "#AA4499", "#88CCEE", "#44AA99","#44AA99","#44AA99","#44AA99"), breaks = c("Fitness", "half_life_short", "half_life_long", "C_max_IC50_long"), labels = c("Fitness cost", "Half-life (days) of the\nshort-acting drug", "Half-life (days) of the\nlong-acting drug", "Cmax/EC50 of the\nlong-acting drug"), drop = FALSE) + scale_linetype_manual( values = c("solid", "solid", "dashed"), name = "EIR:", breaks = c("5", "10", "500"), labels = c("5", "10", "500")) + ggtitle(label = "") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(-1, 0.2, 1, 0.2)/constant, "cm")) + geom_hline(yintercept = 0, linetype = "dotted", color = "#999999", size = 1.5) + theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2)) #pl11 # do the plot for drug B Quantil_final_4_2 <- Quantil_final_4[Quantil_final_4$drug == "B", ] Quantil_final_4_2<-Quantil_final_4_2[Quantil_final_4_2$G=="half_life_long" & Quantil_final_4_2$Access==0.5 & Quantil_final_4_2$Resistance_level==2.5 | Quantil_final_4_2$G=="C_max_IC50_long" & Quantil_final_4_2$Access==0.5 & Quantil_final_4_2$Resistance_level==10| Quantil_final_4_2$G=="Fitness" & Quantil_final_4_2$Access==0.04,] # adjust the label Label_yy_1 <- c("", "", "", "", "") S.labs2 <- c("", "") names(S.labs2) <- c("sesonality1", "sesonality2") T.labs2 <- c("", "") names(T.labs2) <- c("0.04", "0.5") D.labs2 <- c("", "") names(D.labs2) <- c("1", "0") pl12 <- ggplot(data = Quantil_final_4_2) + geom_line(aes(x = x, y = M, color = G, linetype = EIR), size = 1.9/constant, alpha = 1) + # facet_nested(drug~Access+Seasonality+Dosage,labeller=labeller(drug= Dr.labs,Access=T.labs, Dosage=D.labs, Seasonality=S.labs,Resistance_level=R.labs)) + facet_nested(drug ~ Access + Resistance_level, labeller = labeller(drug = Dr.labs, Access = T.labs2, Dosage = D.labs, Seasonality = S.labs2, Resistance_level = R.labs)) + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient", limits=c(-0.125,0.6)) + scale_x_continuous(name = "", breaks = break_y, labels = Label_yy) + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"),) + scale_color_manual( name = "Factors:", values = c( "#999933", "#CC6677", "#AA4499", "#88CCEE", "#44AA99"), breaks = c("Fitness", "half_life_short", "half_life_long", "C_max_IC50_short", "C_max_IC50_long"), labels = c("Fitness cost", "Half-life drug A (days)", "Half-life drug B (day)", "Cmax/EC50 drug A", "Cmax/EC50 drug B")) + scale_linetype_manual( values = c("solid", "solid", "dashed"), name = "EIR:", breaks = c("5", "10", "500"), labels = c("5", "10", "500")) + ggtitle(label = "") + theme( strip.text.x = element_blank(), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(-1, 0.2, 1, 0.2)/constant, "cm")) + theme(strip.background.x = element_rect(fill = "white", colour = "white")) + geom_hline(yintercept = 0, linetype = "dotted", color = "#999999", size = 1.5) + theme(legend.position = "none") #pl12 # do the plot for drug A and B Quantil_final_4_3 <- Quantil_final_4[Quantil_final_4$drug == "A+B", ] Quantil_final_4_3<-Quantil_final_4_3[Quantil_final_4_3$G=="C_max_IC50_long" & Quantil_final_4_3$Access==0.5 | Quantil_final_4_3$G=="Fitness" & Quantil_final_4_3$Access==0.04,] # adjust the label Label_yy_1 <- c("", "", "", "", "") S.labs2 <- c("", "") names(S.labs2) <- c("sesonality1", "sesonality2") T.labs2 <- c("", "") names(T.labs2) <- c("0.04", "0.5") D.labs2 <- c("", "") names(D.labs2) <- c("1", "0") pl13 <- ggplot(data = Quantil_final_4_3) + geom_line(aes(x = x, y = M, color = G, linetype = EIR), size = 1.9/constant, alpha = 1) + # facet_nested(drug~Access+Seasonality+Dosage,labeller=labeller(drug= Dr.labs,Access=T.labs, Dosage=D.labs, Seasonality=S.labs,Resistance_level=R.labs)) + facet_nested(drug ~ Access + Seasonality + Resistance_level, labeller = labeller(drug = Dr.labs, Access = T.labs2, Dosage = D.labs, Seasonality = S.labs2, Resistance_level = R.labs)) + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient",limits=c(-0.125,0.6)) + scale_x_continuous(name = "", breaks = break_y, labels = Label_yy) + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold", hjust = 0.3), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18, hjust = 0.75, face = "bold")) + scale_color_manual( name = "Factors:", values = c( "#999933", "#CC6677", "#AA4499", "#88CCEE", "#44AA99"), breaks = c("Fitness", "half_life_short", "half_life_long", "C_max_IC50_short", "C_max_IC50_long"), labels = c("Fitness cost", "Half-life drug A (day)", "Half-life drug B (day)", "Cmax/EC50 drug A", "Cmax/EC50 drug B")) + scale_linetype_manual( values = c("solid", "solid", "dashed"), name = "EIR:", breaks = c("5", "10", "500"), labels = c("5", "10", "500")) + ggtitle(label = "") + theme( strip.text.x = element_blank(), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(-2, 0.2, 1, 0.2)/constant, "cm")) + theme(strip.background.x = element_rect(fill = "white", colour = "white")) + geom_hline(yintercept = 0, linetype = "dotted", color = "#999999", size = 1.5) + theme(legend.position = "none") #pl13 # merge all the plots Test_1 <- plot_grid(pl11, pl12, pl13, ncol = 1, nrow = 3, rel_heights = c(1.55, 1, 1), scale = c(1, 1, 1)) Test_1<-Test_1+ draw_label("Fitness cost", x = 0.12, y = 0.0308,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.12, y = 0.3125,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.12, y = 0.5942,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.3475, y = 0.0308,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.3475, y = 0.3125,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.3475, y = 0.5942,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.554, y = 0.0165,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nlong-acting drug", x = 0.541, y = 0.2982,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nshort-acting drug", x = 0.541, y = 0.5799,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.7825, y = 0.0165,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.7825, y = 0.2982,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nshort-acting drug", x = 0.769, y = 0.5799,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold") Test_1 <- plot_grid(pl11, pl12, pl13, ncol = 1, nrow = 3, rel_heights = c(1.8, 1, 1), scale = c(1, 1, 1)) Test_1<-Test_1+ draw_label("Fitness cost", x = 0.118, y = 0.04275,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.118, y = 0.305,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.118, y = 0.5673,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.336, y = 0.04275,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.336, y = 0.305,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Fitness cost", x = 0.336, y = 0.5673,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.528, y = 0.024,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nlong-acting drug", x = 0.5125, y = 0.28625,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nshort-acting drug", x = 0.5125, y = 0.549,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.7465, y = 0.024,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Cmax/EC50 of the\nlong-acting drug", x = 0.7465, y = 0.28625,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold")+ draw_label("Half-life (days) of the\nshort-acting drug", x = 0.73, y = 0.549,size=16/2.5, hjust = 0, vjust = 0, fontface ="bold") Test_1</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="magnitude-and-direction-of-effect-of-drug-properties-and-fitness-cost-on-estimated-selection-coefficients-for-low-and-high-levels-of-transmission-degrees-of-drug-resistance-and-levels-of-access-to-treatment-with-monotherapy-or-combination-treatment"> Magnitude and direction of effect of drug properties and fitness cost on estimated selection coefficients for low and high levels of transmission, degrees of drug resistance, and levels of access to treatment with monotherapy or combination treatment.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The curves represent median selection coefficients over the parameter ranges of factors that were determined to have key influences on the rate of spread of drug-resistant genotypes in settings that had an entomological inoculation rate (EIR) of 5 (solid curves) or 500 (dashed curves) inoculations per person per year, and low (10%) or high (80%) levels of access to treatment. Selection coefficients illustrated the spread of parasites resistant to the short- and long-acting drugs when each drug was used as monotherapy and parasites resistant to the short-acting drug when both drugs were used in combination. For each treatment profile, results are shown for parasites with two different degrees of resistance; degree of resistance of 7 (low) and 18 (high) to the short-acting drug (Emax shift), 2.5 (low) and 10 (high) to the long-acting drug (EC50 shift), for the combination of the short-acting and the long-acting drugs, 7 (low) and 18 (high) to the short-acting drug and 10 to the long-acting drug. Results are illustrated for settings with a seasonality pattern of transmission and a population fully adherent to treatment. The impacts of all factors in all settings are shown in <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 1</a>–<a href="#fig3s2" itemscope="" itemtype="http://schema.stenci.la/Link">!number(2)</a>. Parameter ranges are as follows: fitness cost (1.0–1.1); the half-life of the short-acting drug (0.035–0.175 days); the half-life of the long-acting drug (6–22 days); Cmax/EC50 ratio of the long-acting drug (5.1–21.7).</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s1" title="Figure 3—figure supplement 1."><label data-itemprop="label">Figure 3—figure supplement 1.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Transform constrained variable into a factor Quantil_final_final$drug <- factor(Quantil_final_final$drug, levels = c("A", "B", "A+B")) Quantil_final_final$Dosage <- factor(Quantil_final_final$Dosage, levels = c("1", "0")) Quantil_final_final$EIR <- factor(Quantil_final_final$EIR, levels = c("5", "10", "500")) # Creat a label for each constrained variable S.labs <- c("No seasonality", "Seasonality") names(S.labs) <- c("sesonality1", "sesonality2") T.labs <- c("Low access to treatment", "High access to treatment") names(T.labs) <- c("0.04", "0.5") D.labs <- c("High adherence\n to treatment", "Low adherence\n to treatment") names(D.labs) <- c("1", "0") Dr.labs <- c("Short-acting drug", "Long-acting drug", "Short-acting +\nLong-acting drugs") names(Dr.labs) <- c("A", "B", "A+B") Dr.labs_2 <- c("", "", "") names(Dr.labs_2) <- c("A", "B", "A+B") R.labs <- c("Low degree\n of resistance", "Low degree\n of resistance", "High degree\n of resistance", "High degree\n of resistance") names(R.labs) <- c("7", "2.5", "18", "10") R.labs_2 <- c("", "", "", "") names(R.labs_2) <- c("7", "2.5", "18", "10") # creat the label for the y axis break_y <- c(1, 10, 20, 30, 39) Label_yy <- c("Min", "", "", "", "Max") # Select the data Quantil_final_2 <- Quantil_final_final[Quantil_final_final$G == "Fitness" | Quantil_final_final$G == "half_life_short" | Quantil_final_final$G == "C_max_IC50_short" | Quantil_final_final$G == "half_life_long" | Quantil_final_final$G == "C_max_IC50_long", ] Quantil_final_3 <- Quantil_final_2[Quantil_final_2$EIR == 500 | Quantil_final_2$EIR == 5, ] Quantil_final_3 <- Quantil_final_3 # Transform IC50 and Fitness in the good direction Quantil_final_3$x[Quantil_final_3$G == "Fitness"] <- (Quantil_final_3$x[Quantil_final_3$G == "Fitness"] - 40) * -1 Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A"] <- (Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A"] - 40) * -1 Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A+B"] <- (Quantil_final_3$x[Quantil_final_3$G == "C_max_IC50_short" & Quantil_final_3$drug == "A+B"] - 40) * -1 #----- Plot for high level of access to treatment (Figure 3) ---- # plot all high acess to treatment Quantil_final_4 <- Quantil_final_3[Quantil_final_3$Access == 0.5, ] Quantil_final_4 <- Quantil_final_4[!(Quantil_final_4$drug == "A+B" & Quantil_final_4$G == "C_max_IC50_short"), ] Quantil_final_4 <- Quantil_final_4[!(Quantil_final_4$drug == "A+B" & Quantil_final_4$G == "half_life_short"), ] constant<-2 ggplot(data = Quantil_final_4) + geom_line(aes(x = x, y = M, color = G, linetype = EIR), size = 1.9/constant, alpha = 1) + # facet_nested(drug~Access+Seasonality+Dosage,labeller=labeller(drug= Dr.labs,Access=T.labs, Dosage=D.labs, Seasonality=S.labs,Resistance_level=R.labs)) + facet_nested(drug + Resistance_level ~ Seasonality + Dosage, labeller = labeller(drug = Dr.labs, Dosage = D.labs, Seasonality = S.labs, Resistance_level = R.labs)) + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient") + scale_x_continuous(name = "Factor values", breaks = break_y, labels = Label_yy) + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 12/constant)) + theme(legend.title = element_text(size = 12/constant, face = "bold")) + scale_color_manual( name = "Factors:", values = c( "#999933", "#E6959F", "#AA4499", "#88CCEE", "#009E73"), breaks = c("Fitness", "half_life_short", "half_life_long", "C_max_IC50_short", "C_max_IC50_long"), labels = c("Fitness cost", "Half-life (days) of the\nshort-acting drug", "Half-life (days) of the\nlong-acting drug", "Cmax/EC50 of the\nshort-acting drug", "Cmax/EC50 of the\nlong-acting drug")) + scale_linetype_manual( values = c("solid", "solid", "dashed"), name = "EIR (inoculations per person per year):", breaks = c("5", "10", "500"), labels = c("5", "10", "500")) + guides( linetype = guide_legend(keywidth = 5/constant, keyheight = 0.05/constant, override.aes = list(size = 2.5/constant)), colour = guide_legend(keywidth = 2/constant, keyheight = 0.05/constant, override.aes = list(size = 5/constant)), legend.spacing.y = unit(150, "cm")) + ggtitle(label = "") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(0.05, 0.05,0.05 , 0.05), "cm")) + geom_hline(yintercept = 0, linetype = "dotted", color = "#999999", size = 1.5/constant) + theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2))</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="magnitude-and-direction-of-effect-of-drug-properties-and-fitness-cost-on-estimated-selection-coefficients-in-settings-with-high-access-to-treatment-and-different-levels-of-transmission-degrees-of-drug-resistance-treatment-adherence-in-seasonal-or-perennial-settings-with-monotherapy-or-combination-treatment"> Magnitude and direction of effect of drug properties and fitness cost on estimated selection coefficients in settings with high access to treatment and different levels of transmission, degrees of drug resistance, treatment adherence in seasonal, or perennial settings with monotherapy or combination treatment.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The curves represent median selection coefficients over the parameter ranges estimated in each setting that had high access to treatment (80%) and an entomological inoculation rate (EIR) of 5 (solid curves) or 500 (dashed curves) inoculations per person per year. Settings were varied in their seasonality pattern of transmission and level of adherence to treatment (67% [low] or 100% [high] of treatment doses adhered to by the population). For each treatment profile, results are shown for parasites with two different degrees of resistance; degree of resistance of 7 (low) and 18 (high) to the short-acting drug (Emax shift), 2.5 (low) and 10 (high) to the long-acting drug (EC50 shift), for the combination of the short-acting and the long-acting drugs, 7 (low) and 18 (high) to the short-acting drug and 10 to the long-acting drug. Parameter ranges are as follows: fitness cost (1.0–1.1); the short-acting drug half-life (0.035–0.175days); the long-acting drug half-life (6–22days); Cmax/EC50 ratio of the short-acting drug (55.0–312.0); Cmax/EC50 ratio of the long-acting drug at a high level of adherence to treatment (5.4–21.7) and at a low level of adherence (4.0–16.2).</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s2" title="Figure 3—figure supplement 2."><label data-itemprop="label">Figure 3—figure supplement 2.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code>#----- Plot for high level of access to treatment (Figure 3) ---- # plot all high acess to treatment Quantil_final_4 <- Quantil_final_3[Quantil_final_3$Access == 0.04, ] Quantil_final_4 <- Quantil_final_4[!(Quantil_final_4$drug == "A+B" & Quantil_final_4$G == "C_max_IC50_short"), ] Quantil_final_4 <- Quantil_final_4[!(Quantil_final_4$drug == "A+B" & Quantil_final_4$G == "half_life_short"), ] constant<-2 ggplot(data = Quantil_final_4) + geom_line(aes(x = x, y = M, color = G, linetype = EIR), size = 1.9/constant, alpha = 1) + # facet_nested(drug~Access+Seasonality+Dosage,labeller=labeller(drug= Dr.labs,Access=T.labs, Dosage=D.labs, Seasonality=S.labs,Resistance_level=R.labs)) + facet_nested(drug + Resistance_level ~ Seasonality + Dosage, labeller = labeller(drug = Dr.labs, Dosage = D.labs, Seasonality = S.labs, Resistance_level = R.labs)) + theme_bw() + ggtitle("") + scale_y_continuous(name = "Selection coefficient") + scale_x_continuous(name = "Factor values", breaks = break_y, labels = Label_yy) + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 12/constant)) + theme(legend.title = element_text(size = 12/constant, face = "bold")) + scale_color_manual( name = "Factors:", values = c( "#999933", "#E6959F", "#AA4499", "#88CCEE", "#009E73"), breaks = c("Fitness", "half_life_short", "half_life_long", "C_max_IC50_short", "C_max_IC50_long"), labels = c("Fitness cost", "Half-life (days) of the\nshort-acting drug", "Half-life (days) of the\nlong-acting drug", "Cmax/EC50 of the\nshort-acting drug", "Cmax/EC50 of the\nlong-acting drug")) + scale_linetype_manual( values = c("solid", "solid", "dashed"), name = "EIR (inoculations per person per year):", breaks = c("5", "10", "500"), labels = c("5", "10", "500")) + guides( linetype = guide_legend(keywidth = 5/constant, keyheight = 0.05/constant, override.aes = list(size = 2.5/constant)), colour = guide_legend(keywidth = 2/constant, keyheight = 0.05/constant, override.aes = list(size = 5/constant)), legend.spacing.y = unit(150, "cm")) + ggtitle(label = "") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(0.05, 0.05,0.05, 0.05), "cm")) + geom_hline(yintercept = 0, linetype = "dotted", color = "#999999", size = 1.5/constant) + theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2))</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="magnitude-and-direction-of-effect-of-drug-properties-and-fitness-cost-on-estimated-selection-coefficients-in-settings-with-low-access-to-treatment-and-different-levels-of-transmission-degree-of-drug-resistance-treatment-adherence-in-seasonal-or-perennial-settings-with-monotherapy-or-combination-treatment"> Magnitude and direction of effect of drug properties and fitness cost on estimated selection coefficients in settings with low access to treatment and different levels of transmission, degree of drug resistance, treatment adherence in seasonal, or perennial settings with monotherapy or combination treatment.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The solid and dashed lines represent the median selection coefficients over the parameter ranges estimated in each setting that had low access to treatment (10%) and an entomological inoculation rate (EIR) of 5 (solid lines) or 500 (dashed lines) inoculations per person per year. Settings varied in their seasonality pattern and level of adherence to treatment (low = 67%and high = 100%). For each treatment profile, we show results for parasites with two different degrees of resistance; degree of resistance of 7 (low) and 18 (high) to the short-acting drug (Emax shift), 2.5 (low) and 10 (high) to the long-acting drug (EC50 shift), and with combination of the short-acting and the long-acting drugs, 7 (low) and 18 (high) to the short-acting drug and 10 to the long-acting drug. The parameter ranges were the following: fitness cost (1, 1.1); the short-acting drug half-life (0.035, 0.175) days; the long-acting drug half-life (6, 22) days; Cmax/EC50 ratio of the short-acting drug (55, 312); Cmax/EC50 ratio of the long-acting drug at a high level of adherence to treatment (5.4, 21.7); and at a low level of adherence (4.0, 16.2).</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s3" title="Figure 3—figure supplement 3."><label data-itemprop="label">Figure 3—figure supplement 3.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># load the data data <- read.csv(file = "data/Figure3-figuresupplement3-Sourcedata1.csv", header = TRUE) # Transform the constrained variable into factor data$Resistance_level <- factor(data$Resistance_level, levels = c("7", "18")) data$Dosage <- factor(data$Dosage, levels = c("4", "0")) data$EIR <- factor(data$EIR, levels = c("5", "10", "500")) data$Treatment_access <- factor(data$Treatment_access, levels = c("0.5", "0.04")) # Creat a label for each constrained variable T.labs <- c("High access to treatment", "Low access to treatment") names(T.labs) <- c("0.5", "0.04") R.labs <- c("High degree\n of resistance", "Low degree\n of resistance") names(R.labs) <- c("18", "7") D.labs <- c("High adherence\n to treatment", "Low adherence\n to treatment") names(D.labs) <- c("4", "0") S.labs <- c("No seasonality", "Seasonality") names(S.labs) <- c("sesonality1", "sesonality2") # define the break for the y axis break_y <- c(0, 0.25, 0.5, 0.75, 1) Label_yy <- c(0, 0.25, 0.5, 0.75, 1) # select the data data_2 <- data[data$Effect == "First", ] # order the level of each factors data_2$Factor <- factor(data_2$Factor, levels = c("Diagnostic", "MKR", "IC50_S", "half_life", "Fitness")) constant<-2 # visualise pd <- position_dodge ggplot(data_2, aes(x = EIR, y = First, fill = Factor)) + geom_col(color = "black", width = 0.6) + facet_nested(Treatment_access + Resistance_level ~ Seasonality+ Dosage, labeller = labeller(Resistance_level = R.labs, Treatment_access = T.labs, Dosage = D.labs, Seasonality = S.labs)) + scale_fill_manual( name = "Factors:", values = c( "#999933", "#E6959F", "#88CCEE", "#882255", "#888888"), breaks = c("Fitness", "half_life", "IC50_S", "MKR", "Diagnostic"), labels = c("\nFitness cost\n", "\nHalf-life (days) of the\nshort-acting drug", "\nCmax/EC50 of the\nshort-acting drug", "\nEmax (per day) of the\nshort-acting drug", "\nDiagnostic detection\nlimit (parasites/ul)")) + theme(axis.title = element_text(face = "bold")) + ylab("First-order indices") + xlab("EIR (inoculations per person per year)") + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 15/constant)) + theme(legend.title = element_text(size = 15/constant, face = "bold")) + ggtitle(label = "Short-acting drug") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + scale_y_continuous(breaks = break_y, labels = Label_yy) + theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2))</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="first-order-indices-describing-level-of-importance-of-each-factor-varied-in-the-constrained-sensitivity-analysis-of-the-spread-of-a-genotype-resistant-to-the-short-acting-drug-used-in-monotherapy"> First-order indices describing level of importance of each factor varied in the constrained sensitivity analysis of the spread of a genotype resistant to the short-acting drug used in monotherapy.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The first-order indices were assessed for parasites that had different degrees of resistance to the short-acting drug (low = 7and high = 18-fold decrease in Emax) in settings that differ in their levels of access to treatment (high = 10%and low = 80%), levels of transmission (5, 10, and 500 inoculations per person per year), transmission patterns (no seasonality and seasonality), and levels of adherence to treatment (low = 67% and high = 100%). The explored parameter ranges were the following: the fitness cost (1, 1.1); the half-life of the short-acting drug (0.035, 0.175) days; the ratio Cmax/EC50 of the short-acting drug (55, 312); the Emax of the short-acting drug (27.5, 31.0) per day; and the diagnostic detection limit (2, 50) parasites/µl.</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s4" title="Figure 3—figure supplement 4."><label data-itemprop="label">Figure 3—figure supplement 4.</label> <stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># load the data data <- read.csv(file = "data/Figure3-figuresupplement4-Sourcedata1.csv", header = TRUE) # transform the constrained variable into factor data$Resistance_level <- factor(data$Resistance_level, levels = c("2.5", "10")) data$Dosage <- factor(data$Dosage, levels = c("1", "0")) data$EIR <- factor(data$EIR, levels = c("5", "10", "500")) data$Treatment_access <- factor(data$Treatment_access, levels = c("0.5","0.04")) # creat a lavel for each constrained variable T.labs <- c("High access to treatment", "Low access to treatment") names(T.labs) <- c("0.5", "0.04") R.labs <- c("High degree\n of resistance", "Low degree\n of resistance") names(R.labs) <- c("10", "2.5") D.labs <- c("High adherence\n to treatment", "Low adherence\n to treatment") names(D.labs) <- c("1", "0") S.labs <- c("No seasonality", "Seasonality") names(S.labs) <- c("sesonality1", "sesonality2") # define the break for the y axis break_y <- c(0, 0.25, 0.5, 0.75, 1) Label_yy <- c(0, 0.25, 0.5, 0.75, 1) # ---- visualize the first order indices of each factors ----- # select the data data_2 <- data[data$Effect == "First", ] # define the level of the variable factors data_2$Factor <- factor(data_2$Factor, levels = c("MKR", "Diangostic", "Cmax/IC50", "half-life", "Fitness")) constant<-2 # Visualize ggplot(data_2, aes(x = EIR, y = First, fill = Factor)) + geom_col(color = "black", width = 0.6) + facet_nested(Treatment_access + Resistance_level ~ Seasonality+ Dosage, labeller = labeller(Resistance_level = R.labs, Treatment_access = T.labs, Dosage = D.labs, Seasonality = S.labs)) + scale_fill_manual( name = "Factors:", values = c( "#999933", "#AA4499", "#009E73", "#661100", "#888888"), breaks = c("Fitness", "half-life", "Cmax/IC50", "MKR", "Diangostic"), labels = c("\nFitness cost\n", "\nHalf-life (days) of the\nlong-acting drug", "\nCmax/EC50 of the\nlong-acting drug", "\nEmax (per day) of the\nlong-acting drug", "\nDiagnostic detection\nlimit (parasites/ul)")) + theme(axis.title = element_text(face = "bold")) + ylab("First-order indices") + xlab("EIR (inoculations per person per year)") + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 16/constant)) + theme(legend.title = element_text(size = 16/constant, face = "bold")) + ggtitle(label = "Long-acting drug") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + scale_y_continuous(breaks = break_y, labels = Label_yy)+ theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2))</code></pre> </stencila-code-chunk> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="first-order-indices-of-each-factor-varied-in-the-constrained-sensitivity-analysis-of-the-spread-of-a-genotype-resistant-to-the-long-acting-drug-used-in-monotherapy"> First-order indices of each factor varied in the constrained sensitivity analysis of the spread of a genotype resistant to the long-acting drug used in monotherapy.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The first-order indices were assessed for parasites that had different degrees of resistance to the long-acting drug (low = 2.5and high = 10-fold increase in EC50) in settings that differ in their levels of access to treatment (low = 10 % and high = 80%), levels of transmission (5, 10, and 500 inoculations per person per year), transmission patterns (no seasonality and seasonality), and levels of adherence to treatment (low = 67% and high = 100%). The explored parameter ranges were the following: the fitness cost (1, 1.1); the half-life of the long-acting drug (6, 22) days; the ratio Cmax/EC50 of the long-acting drug at a high level of adherence to treatment (5.4, 21.7) and at a low level of adherence to treatment (4.0, 16.2); the Emax of the long-acting drug (3.45, 5.00) per day; and the diagnostic detection limit (2, 50) parasites/µl.</p> </figcaption> </figure> <figure itemscope="" itemtype="http://schema.stenci.la/Figure" title="Figure 3—figure supplement 5."><label data-itemprop="label">Figure 3—figure supplement 5.</label> <figcaption> <h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="first-order-indices-of-each-factor-varied-in-the-constrained-sensitivity-analysis-of-the-spread-of-a-genotype-resistant-to-the-short-acting-drug-when-the-short-acting-drug-and-the-long-acting-drug-are-used-in-combination"> First-order indices of each factor varied in the constrained sensitivity analysis of the spread of a genotype resistant to the short-acting drug when the short-acting drug and the long-acting drug are used in combination.</h4> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The first-order indices were assessed for parasites that had different degrees of resistance to the short-acting drug (low = 7and high = 18-fold decrease in Emax) in settings that differ in their levels of access to treatment (low = 10% and high = 80%), levels of transmission (5, 10, and 500 inoculations per person per year), transmission patterns (no seasonality and seasonality), and levels of adherence to treatment (low = 67% and high = 100%). The explored parameter ranges were the following: the fitness cost (1, 1.1); the half-life of the short-acting drug (0.035, 0.175) days; the half-life of the long-acting drug (6, 22) days; the ratio Cmax/EC50 of the short-acting drug (55, 312); the ratio Cmax/EC50 of the long-acting drug at a high level of adherence to treatment (5.4, 21.7) and at a low level of adherence to treatment (4.0, 16.2); the Emax of the short-acting drug (27.5, 31.0) per day; the Emax of the long-acting drug (3.45, 5) per day; and the diagnostic detection limit (2, 50) parasites/µl.</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">chunk:</p> </figcaption> </figure> <pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock"><code># load the data data <- read.csv(file = "data/Figure3-figure-supplement5-Sourcedata1.csv", header = TRUE) # transform the constrained variable into factor data$Resistance_level <- factor(data$Resistance_level, levels = c("7", "18")) data$Dosage <- factor(data$Dosage, levels = c("1", "0")) data$EIR <- factor(data$EIR, levels = c("5", "10", "500")) data$Treatment_access <- factor(data$Treatment_access, levels = c("0.5","0.04")) # creat a lavel for each constrained variable T.labs <- c("High access to treatment", "Low access to treatment") names(T.labs) <- c("0.5", "0.04") R.labs <- c("High degree\n of resistance", "Low degree\n of resistance") names(R.labs) <- c("18", "7") D.labs <- c("High adherence\n to treatment", "Low adherence\n to treatment") names(D.labs) <- c("1", "0") S.labs <- c("No seasonality", "Seasonality") names(S.labs) <- c("sesonality1", "sesonality2") # define the break for the y axis break_y <- c(0, 0.25, 0.5, 0.75, 1) Label_yy <- c(0, 0.25, 0.5, 0.75, 1) # ---- visualise the first order indices of each factors ----- # select the data data_2 <- data[data$Effect == "First", ] # order the level of each factors data_2$Factor <- factor(data_2$Factor, levels = c( "Diangostic", "MKR_short", "MKR_long", "IC50_S_short", "half-life_short", "half-life_long", "Cmax/IC50", "Fitness")) constant<-2 # visualise ggplot(data_2, aes(x = EIR, y = First, fill = Factor)) + geom_col(color = "black", width = 0.6) + facet_nested(Treatment_access + Resistance_level ~ Seasonality + Dosage, labeller = labeller(Resistance_level = R.labs, Treatment_access = T.labs, Dosage = D.labs, Seasonality = S.labs)) + scale_fill_manual( values = c( "#999933", "#E6959F", "#AA4499", "#88CCEE", "#009E73", "#882255", "#661100", "#888888"), name = "Factors:", breaks = c("Fitness", "half-life_short", "half-life_long", "IC50_S_short", "Cmax/IC50", "MKR_short", "MKR_long", "Diangostic"), labels = c("\nFitness cost\n", "\nHalf-life (days) of the\nshort-acting drug", "\nHalf-life of the\nlong-acting drug", "\nCmax/EC50 of the\nshort-acting drug\n", "\nCmax/EC50 of the\nlong-acting drug\n", "\nEmax (per day) of the\nshort-acting drug", "\nEmax (per day) of the\nshort-acting drug", "\nDiagnostic detection\nlimit (parasites/ul)")) + theme(axis.title = element_text(face = "bold")) + ylab("First-order indices") + xlab("EIR (inoculations per person per year)") + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.x = element_text(size = 16/constant, face = "bold"), axis.title.y = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 20/constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 16/constant)) + theme(legend.title = element_text(size = 16/constant, face = "bold")) + ggtitle(label = "Short-acting + Long-acting drugs") + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + scale_y_continuous(breaks = break_y, labels = Label_yy) + theme(legend.position="top", legend.box="vertical") + guides(fill=guide_legend(nrow=2))</code></pre> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">::: {warning=FALSE}</p> <p itemscope="" itemtype="http://schema.stenci.la/Paragraph">::: {#fig3s5}</p><figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s6" title="Figure 3—figure supplement 6."><label data-itemprop="label">Figure 3—figure supplement 6.</label><stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"><pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Load the data Scenario_liste <- read.csv(file = "data/Figure3-figuresupplement679-Sourcedata1.csv", header = TRUE) # Change arm information into factor Scenario_liste$drug <- factor(Scenario_liste$drug, levels = c("Drug A", "Drug B", "Drug A + Drug B")) Scenario_liste$eir <- factor(Scenario_liste$eir, levels = c("5", "10", "500")) Scenario_liste$Access <- factor(Scenario_liste$Access, levels = c("0.04", "0.5")) Scenario_liste$Resistance_Level <- factor(Scenario_liste$Resistance_Level, levels = c("2.5", "7", "10", "18")) Scenario_liste$Dosage <- factor(Scenario_liste$Dosage, levels = c("1", "0")) Scenario_liste$seasonality <- factor(Scenario_liste$seasonality, levels = c("sesonality1", "sesonality2")) #---- Plot at high level of access to treatment (Figure_3_supplement_5) ---- # Select arm that have a high level of treatment access Scenario_liste_2 <- Scenario_liste[Scenario_liste$Access == 0.5, ] Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 2.5] <- 7 Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 10] <- 18 Scenario_liste_2 <- Scenario_liste_2[Scenario_liste_2$Resistance_Level == 7, ] # Define the label R.labs <- c( "Low resistance\n level", "Low resistance\n level", "High resistance\n level", "High resistance\n level") names(R.labs) <- c("7", "2.5", "18", "10") Dr.labs <- c("Short-acting drug", "Long-acting drug", "Short-acting +\nLong-acting drugs") names(Dr.labs) <- c("Drug A", "Drug B", "Drug A + Drug B") constant<-2 # Plot by level of adherence to treatment pd <- position_dodge(0.9) PP1 <- ggplot(Scenario_liste_2, aes(x = Dosage, y = Indicator, fill = Dosage)) + geom_boxplot(position = pd) + labs(title = "", x = "Adherence to treatment (%)", y = "Selection coefficient") + scale_x_discrete(labels = c("1" = "100%", "0" = "60%")) + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + scale_fill_manual( name = "Adherence to\n treatment", values = c("lightblue", "blue"), breaks = c(1, 0), labels = c("100 %", "60 %")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Plot by level of seasonality pd <- position_dodge(0.9) PP2 <-ggplot(Scenario_liste_2, aes(x = seasonality, y = Indicator, fill = seasonality)) + geom_boxplot(position = pd) + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + labs(title = "", x = "Seasonality", y = "Selection coefficient") + scale_x_discrete(labels = c("sesonality1" = "No", "sesonality2" = "Yes")) + scale_fill_manual( name = "Seasonality", values = c("lightblue", "blue"), breaks = c("sesonality1", "sesonality2"), labels = c("No", "Yes")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme(axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Plot by level of transmission pd <- position_dodge(0.9) PP3 <- ggplot(Scenario_liste_2, aes(x = eir, y = Indicator, fill = eir)) + geom_boxplot(position = pd) + labs(title = "", x = "EIR (inoculations per person per year)", y = "Selection coefficient") + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + scale_x_discrete(labels = c("5" = "5", "10" = "10", "500" = "500")) + scale_fill_manual(name = "EIR", values = c("white", "lightblue", "blue")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Merge all plot grid.arrange(PP3,PP2,PP1,ncol=1)</code></pre></stencila-code-chunk><figcaption><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="distribution-of-the-estimated-selection-coefficient-for-resistant-parasites-with-a-low-degree-of-resistance-in-different-transmission-settings-with-high-access-to-treatment">Distribution of the estimated selection coefficient for resistant parasites with a low degree of resistance in different transmission settings with high access to treatment.</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Selection coefficients of resistant genotypes were estimated for each treatment profile during the constrained sensitivity analysis assuming resistant parasites have a low degree of resistance (equal to <em itemscope="" itemtype="http://schema.stenci.la/Emphasis"><span data-itemtype="http://schema.org/Number">7</span></em> for the short-acting drug [Emax shift] and 2.5 for the long-acting drug [EC50 shift]), in settings with a high access to treatment (80%). The distributions are stratified by (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">A</strong>) the intensity of transmission (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">B</strong>) the seasonality pattern, and (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">C</strong>) the level of adherence to treatment in the settings.</p></figcaption></figure><figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s7" title="Figure 3—figure supplement 7."><label data-itemprop="label">Figure 3—figure supplement 7.</label><stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"><pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Select arm that have a high level of treatment access Scenario_liste_2 <- Scenario_liste[Scenario_liste$Access == 0.5, ] Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 2.5] <- 7 Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 10] <- 18 Scenario_liste_2 <- Scenario_liste_2[Scenario_liste_2$Resistance_Level == 18, ] # Define the label R.labs <- c( "Low resistance\n level", "Low resistance\n level", "High resistance\n level", "High resistance\n level") names(R.labs) <- c("7", "2.5", "18", "10") Dr.labs <- c("Short-acting drug", "Long-acting drug", "Short-acting +\nLong-acting drugs") names(Dr.labs) <- c("Drug A", "Drug B", "Drug A + Drug B") constant<-2 # Plot by level of adherence to treatment pd <- position_dodge(0.9) PP1 <- ggplot(Scenario_liste_2, aes(x = Dosage, y = Indicator, fill = Dosage)) + geom_boxplot(position = pd) + labs(title = "", x = "Adherence to treatment (%)", y = "Selection coefficient") + scale_x_discrete(labels = c("1" = "100%", "0" = "60%")) + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + scale_fill_manual( name = "Adherence to\n treatment", values = c("lightblue", "blue"), breaks = c(1, 0), labels = c("100 %", "60 %")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Plot by level of seasonality pd <- position_dodge(0.9) PP2 <-ggplot(Scenario_liste_2, aes(x = seasonality, y = Indicator, fill = seasonality)) + geom_boxplot(position = pd) + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + labs(title = "", x = "Seasonality", y = "Selection coefficient") + scale_x_discrete(labels = c("sesonality1" = "No", "sesonality2" = "Yes")) + scale_fill_manual( name = "Seasonality", values = c("lightblue", "blue"), breaks = c("sesonality1", "sesonality2"), labels = c("No", "Yes")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme(axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Plot by level of transmission pd <- position_dodge(0.9) PP3 <- ggplot(Scenario_liste_2, aes(x = eir, y = Indicator, fill = eir)) + geom_boxplot(position = pd) + labs(title = "", x = "EIR (inoculations per person per year)", y = "Selection coefficient") + facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + scale_x_discrete(labels = c("5" = "5", "10" = "10", "500" = "500")) + scale_fill_manual(name = "EIR", values = c("white", "lightblue", "blue")) + scale_color_manual( name = "Resistance level", values = c("black", "grey"), breaks = c(2.5, 10), labels = c("Low (2.5)", "High (10)")) + theme_bw() + theme( axis.text.x = element_text(size = 15/constant), axis.text.y = element_text(size = 15/constant), axis.title.y = element_text(size = 16/constant, face = "bold"), axis.title.x = element_text(size = 16/constant, face = "bold"), plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), legend.text = element_text(size = 16/constant), legend.title = element_text(size = 16/constant)) + theme( strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + theme(legend.position = "none") # Merge all plot grid.arrange(PP3,PP2,PP1,ncol=1)</code></pre></stencila-code-chunk><figcaption><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="distribution-of-the-estimated-selection-coefficients-for-resistant-parasites-with-a-high-degree-of-resistance-in-different-transmission-settings-with-high-access-to-treatment">Distribution of the estimated selection coefficients for resistant parasites with a high degree of resistance in different transmission settings with high access to treatment.</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Selection coefficients of resistant genotypes were estimated for each treatment profile during the constrained sensitivity analysis assuming resistant genotypes have a high degree of resistance (equal to 18 for the short-acting drug [Emax shift] and 10 for the long-acting drug [EC50 shift]), in settings with high access to treatment (80%). Distributions were stratified by (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">A</strong>) intensity of transmission, (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">B</strong>) seasonality pattern, and (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">C</strong>) the level of adherence to treatment in the settings.</p></figcaption></figure><figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s8" title="Figure 3—figure supplement 8."><label data-itemprop="label">Figure 3—figure supplement 8.</label><stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"><pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Load the data Scenario_liste<-read.csv(file = "data/Figure3-figuresupplement8-Sourcedata1.csv", header=T) Scenario_liste_2<-Scenario_liste[Scenario_liste$Access==0.5 & Scenario_liste$seed==2 & Scenario_liste$eir<=400,] Scenario_liste_3<-NULL Scenario_liste_3$eir<-c(Scenario_liste_2$eir,Scenario_liste_2$eir) Scenario_liste_3$Percentage<-c(Scenario_liste_2$Treated_Total,Scenario_liste_2$Treated_infectTotal) Scenario_liste_3$Total<-c(rep("Person", length(Scenario_liste_2$eir)),rep("infection", length(Scenario_liste_2$eir))) Scenario_liste_3<-as.data.frame(Scenario_liste_3) #Plot constant<-2 ggplot(Scenario_liste_3,aes(x=eir, y=Percentage*100, col=Total))+ geom_point(size=3/constant)+ ylim(0,30)+ ylab("Percentage (%)")+ xlab("EIR (inoculation per person per year)")+ scale_color_manual(name ="Percentage of:", values=c(1,2), #values=c(SteppedSequential5Steps[9],SteppedSequential5Steps[17]), breaks=c("person", "infection"), labels=c("People that received treatment", "Infected people that received treatment") )+ theme_bw() + theme( axis.text.x = element_text(size = 16/constant), axis.text.y = element_text(size = 16/constant), axis.title.x = element_text(size = 18/constant, face = "bold"), axis.title.y = element_text(size = 18/constant, face = "bold")) + theme(legend.text = element_text(size = 18/constant)) + theme(legend.title = element_text(size = 18/constant, face = "bold")) + theme(legend.key.size = unit(0.9, "cm")) + theme(legend.key.width = unit(1.0, "cm"))+ theme(legend.position = c(0.5, 0.8))</code></pre></stencila-code-chunk><figcaption><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="treatment-usage">Treatment usage.</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The figure highlights the relationship between the transmission intensity (EIR) and the percentage of people that received treatment during a month (orange dots) and the percentage of infected people that received treatment during a month (blue dots). In this illustration, the level of access to treatment was equal to 80%, and the transmission was perennial. EIR: entomological inoculation rate.</p></figcaption></figure><figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig3s9" title="Figure 3—figure supplement 9."><label data-itemprop="label">Figure 3—figure supplement 9.</label><stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"><pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Scenario_liste_2 <- Scenario_liste[Scenario_liste$Access == 0.04, ] # Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 2.5] <- 7 # Scenario_liste_2$Resistance_Level[Scenario_liste_2$Resistance_Level == 10] <- 18 # Scenario_liste_2 <- Scenario_liste_2[Scenario_liste_2$Resistance_Level == 7, ] # # # define the label # R.labs <- c( # "Low resistance\n level", # "Low resistance\n level", # "High resistance\n level", # "High resistance\n level") # # names(R.labs) <- c("7", "2.5", "18", "10") # # constant<-2 # # plot by level of treatment adherence # pd <- position_dodge(0.9) # PP1 <- ggplot(Scenario_liste_2, aes(x = Dosage, y = Indicator, fill = Dosage)) + # geom_boxplot(position = pd) + # labs(title = "", x = "Adherence to treatment (%)", y = "Selection coefficient") + # scale_x_discrete(labels = c("1" = "100%", "0" = "60%")) + # facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + # scale_fill_manual( # name = "Adherence to\n treatment", # values = c("lightblue", "blue"), # breaks = c(1, 0), # labels = c("100 %", "60 %")) + # scale_color_manual( # name = "Resistance level", # values = c("black", "grey"), # breaks = c(2.5, 10), # labels = c("Low (2.5)", "High (10)")) + # theme_bw() + # theme( # axis.text.x = element_text(size = 15/constant), # axis.text.y = element_text(size = 15/constant), # axis.title.y = element_text(size = 16/constant, face = "bold"), # axis.title.x = element_text(size = 16/constant, face = "bold"), # plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), # legend.text = element_text(size = 16/constant), # legend.title = element_text(size = 16/constant)) + # theme( # strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), # strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + # theme(legend.position = "none") # # # plot by level of seasonality # pd <- position_dodge(0.9) # PP2 <- ggplot(Scenario_liste_2, # aes(x = seasonality, y = Indicator, fill = seasonality)) + # geom_boxplot(position = pd) + # facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + # labs(title = "", x = "Seasonality", y = "Selection coefficient") + # scale_x_discrete(labels = c("sesonality1" = "No", "sesonality2" = "Yes")) + # scale_fill_manual( # name = "Seasonality", # values = c("lightblue", "blue"), # breaks = c("sesonality1", "sesonality2"), # labels = c("No", "Yes")) + # scale_color_manual( # name = "Resistance level", # values = c("black", "grey"), # breaks = c(2.5, 10), # labels = c("Low (2.5)", "High (10)")) + # theme_bw() + # theme( # axis.text.x = element_text(size = 15/constant), # axis.text.y = element_text(size = 15/constant), # axis.title.y = element_text(size = 16/constant, face = "bold"), # axis.title.x = element_text(size = 16/constant, face = "bold"), # plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), # legend.text = element_text(size = 16/constant), # legend.title = element_text(size = 16/constant)) + # theme( # strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), # strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + # theme(legend.position = "none") # # # plot by level of transmission # pd <- position_dodge(0.9) # PP3 <- ggplot(Scenario_liste_2, aes(x = eir, y = Indicator, fill = eir)) + # geom_boxplot(position = pd) + # labs(title = "", x = "EIR (inoculations per person per year)", y = "Selection coefficient") + # facet_grid( ~ drug,labeller = labeller(drug = Dr.labs)) + # scale_x_discrete(labels = c("5" = "5", "10" = "10", "500" = "500")) + # scale_fill_manual(name = "EIR", # values = c("white", "lightblue", "blue")) + # scale_color_manual( # name = "Resistance level", # values = c("black", "grey"), # breaks = c(2.5, 10), # labels = c("Low (2.5)", "High (10)")) + # theme_bw() + # theme( # axis.text.x = element_text(size = 15/constant), # axis.text.y = element_text(size = 15/constant), # axis.title.y = element_text(size = 16/constant, face = "bold"), # axis.title.x = element_text(size = 16/constant, face = "bold"), # plot.title = element_text(size = 18/constant, hjust = 0.5, face = "bold"), # legend.text = element_text(size = 16/constant), # legend.title = element_text(size = 16/constant)) + # theme( # strip.text.x = element_text(size = 16/constant, color = "black", face = "bold"), # strip.text.y = element_text(size = 16/constant, color = "black", face = "bold")) + # theme(legend.position = "none") # Merge all plot # plot_grid( # PP3, # PP2, # PP1, # ncol = 1, # nrow = 3, # rel_widths = c(1, 1), # scale = 1, # labels = c('A', 'B', "C"), # label_size = 18/constant)</code></pre></stencila-code-chunk><figcaption><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="distribution-of-selection-coefficient-of-parasites-with-a-low-degree-of-resistance-in-different-settings-with-low-access-to-treatment">Distribution of selection coefficient of parasites with a low degree of resistance in different settings with low access to treatment.</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The selection coefficients were estimated for each treatment profile during the constrained sensitivity analysis of the spread of resistant genotypes having a low degree of resistance (equal to 7 for the short-acting drug [Emax shift] and 2.5 for the long-acting drug [EC50 shift]), in settings with a low access to treatment (10%). The distributions are stratified by (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">A</strong>) the intensity of transmission, (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">B</strong>) the seasonality pattern, and (<strong itemscope="" itemtype="http://schema.stenci.la/Strong">C</strong>) the level of adherence to treatment in the settings.</p></figcaption></figure><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Across settings with a low access to treatment, we found that fitness cost had the largest influence on the selection coefficient (<a href="#fig3s3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 3</a>–<a href="#fig3s5" itemscope="" itemtype="http://schema.stenci.la/Link">!number(5)</a>). The fitness cost of a resistant genotype was defined as the relative decrease in the resistant genotype multiplication rate within an untreated human host compared with the sensitive genotype. Consequently, high fitness costs prevented the spread of resistance (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s2" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 2</a>). At a high level of access to treatment, the effect of fitness cost was reduced, and drug properties played a critical role in the spread of drug resistance, and their influence varied for each treatment profile as described below.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">For the short-acting drug used as monotherapy, the half-life had an important influence on the rate of spread (<a href="#fig3s3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 3</a>). A long half-life reduced the spread of resistant parasites by extending the period during which the drug killed partially resistant parasites (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 1</a>). The half-life effect was stronger for parasites with a lower degree of resistance (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 3</a>), as highly resistant parasites were less affected by the drug. Furthermore, the spread of the resistant genotype was faster in populations with low adherence to treatment (<a href="#fig3s6" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 6</a>) because with fewer treatment doses, the parasite was exposed to the drug for a shorter time, leading to higher parasite survival. Overall, these results highlight that the time during which the parasite is exposed to artemisinin is a critical driver of the spread of partial artemisinin resistance.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">For parasites with a low degree of resistance to the long-acting drug used as monotherapy, the drug half-life also had a key influence on the selection coefficient (<a href="#fig3s4" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 4</a>). However, long half-lives were associated with large selection coefficients (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 1</a>). Drugs with a long half-life have an extended period of low drug concentration in treated patients during which only resistant parasites can infect the host. This period of low drug concentration is called the selection window <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Hastings et al.</span><span>2002</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib47"><span>47</span><span>Kay and Hastings</span><span>2015</span></a></cite></span>. These results confirm that the selection window plays a crucial role in the spread of resistance to long-acting drugs.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The spread of parasites with a high degree of resistance to the long-acting drug used as monotherapy was also accelerated by longer drug half-life (<a href="#fig3s4" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 4</a>). For these resistant parasites, the ratio Cmax/EC50 also had an important influence on the rate of spread (<a href="#fig3s4" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 4</a>). This ratio captured the duration of the drug killing effect on the sensitive genotype by assessing the proximity between the EC50 of the sensitive genotype and Cmax. A lower Cmax/EC50 ratio captures a shorter duration of the drug killing effect for the sensitive genotype and, consequently, also a lower duration of the drug killing effect against the resistant genotype (higher EC50). Thus, when the drug had a low Cmax/EC50 ratio, the duration of the drug killing effect was not long enough to ensure the successful clearances of parasites with a higher degree of resistance (higher EC50), favouring their spread (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 1</a>). Furthermore, for parasites with a low degree of resistance (lower EC50), the ratio Cmax/EC50 also influenced the rate of spread in settings with a low level of treatment adherence, since low adherence reduces a Cmax leading to treatment failure (<a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 1</a> and <a href="#fig3s4" itemscope="" itemtype="http://schema.stenci.la/Link">!number(4)</a>). These results highlight the importance of treatment adherence to assure that the drug concentration is high enough to eliminate partially resistant genotypes and limit their spread.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">When the genotype was resistant to the short-acting drug in a population that used the short-acting and the long-acting drugs in combination, factors related to the long-acting drug had the most influence on the selection coefficient (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s5" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 5</a>). When the Cmax/EC50 ratio of the long-acting drug was large, the duration of the killing effect of the long-acting drug on parasites resistant to the short-acting drug was higher, reducing their spread (<a href="#fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3</a>, <a href="#fig3s1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 1</a>). In addition, the rate of spread rose when the level of adherence to treatment was low (<a href="#fig3s6" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 6</a>). These results highlight that the spread of partial resistance to artemisinin strongly depends on the capacity of the partner drug to kill them.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The influence of the transmission intensity (represented by entomological inoculation rate [EIR]) and its seasonality on the selection coefficient varied by treatment profiles and degrees of resistance. When the parasite was resistant to the short-acting drug (when used in monotherapy or combination), selection coefficients were higher in settings with lower EIR (<a href="#fig3s6" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 6</a> and <a href="#fig3s7" itemscope="" itemtype="http://schema.stenci.la/Link">!number(7)</a>). We observed a similar trend for parasites with a high degree of resistance to the long-acting drug used in monotherapy (<a href="#fig3s7" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 7</a>). Two factors account for this trend. First, the selection of parasites resistant to the short-acting drug (low and high degrees of resistance) and parasites highly resistant to the long-acting drug depends on the proportion of treated infections. A higher portion of treated infections can lead to a higher proportion of delayed parasite clearance or treatment failure of drug-resistant infections allowing these resistant genotypes to spread. The proportion of treated infections is higher at lower EIR due to the lower level of immunity (<a href="#fig3s8" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 8</a>). Furthermore, lower immunity levels for individuals living in low transmission settings may also increase the risk of treatment failure and favour the spread of resistance. Second, there is a higher proportion of individuals coinfected by both genotypes at higher EIR. This higher level of co-infection enhanced within-host competition between genotypes, which inhibits the multiplication of resistant parasites within hosts due to their fitness cost and thus limits their spread. Similarly, the spread of resistant parasites was higher in the seasonal settings than in non-seasonal settings (<a href="#fig3s6" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplements 6</a> and <a href="#fig3s7" itemscope="" itemtype="http://schema.stenci.la/Link">!number(7)</a>) due to the reduction of immunity levels and a decline in within-host competition between genotypes during the low transmission season of the seasonal settings. Overall, these results indicate that the spread of partial artemisinin resistance is faster in seasonal settings with low transmission levels.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">However, for parasites with a low degree of resistance to the long-acting drug used in monotherapy, selection coefficients were higher in settings with a large EIR (<a href="#fig3s6" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 6</a>). This arises because the proportion of patients with low drug concentrations persisting from previous treatments increases at higher EIR where higher infection rates increase the overall usage of treatment (<a href="#fig3s8" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 8</a>). These low drug concentrations may fall within the selective window and hence drive the spread of parasites partially resistant to the long-acting drug. Note that this trend was only observed for settings with high access to treatment. In settings with low access to treatment, we observe similar trends as for parasites resistant to the short-acting drug (<a href="#fig3s9" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 3—figure supplement 9</a>) since here, the impact of the selection window was more negligible. These results highlight that the selection window of the long-acting drug can change the interplay between the transmission setting and the spread of drug resistance.</p><h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="probability-of-establishment-of-drug-resistance-and-its-key-drivers">Probability of establishment of drug resistance and its key drivers</h3><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Population genetic theory has shown that the probability of establishment of a mutation depends on two factors: (i) the size of its selection coefficient (i.e. establishment becomes more likely as the mutation becomes more advantageous) and (ii) the degree of heterogeneity in the number of parasite offspring. This occurs because higher heterogeneity increases stochastic fluctuations of allele number, so increases the chance that the mutation is lost despite its advantage <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Hastings and Mackinnon</span><span>1998</span></a></cite></span>. The probability of establishment can also be altered by temporal fluctuation in the population size or magnitude of the selection coefficient <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib98"><span>98</span><span>Waxman</span><span>2011</span></a></cite>. Both effects are likely to be present in seasonal settings of malaria transmission where population size fluctuates, and selection intensity may also change if the level of drug use fluctuates in response to the seasonality of transmission. We avoid these complications by investigating only non-seasonal settings, from which we selected 10 different resistant genotypes having a known selection coefficient and quantified their probability of establishment (see Materials and methods). By doing so, we evaluated the relationship between the selection coefficient and probability of establishment and assessed how this relationship varies across settings due to variation in the heterogeneity of parasite reproductive success.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">As expected, the establishment of a mutation was more probable when its selection coefficient was high (<a href="#fig4" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 4</a>). For each treatment profile, the probability of establishment of mutations with similar selection coefficients was higher at low EIR than at high EIR (<a href="#fig4" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 4</a>), especially for mutations with a high selection coefficient. The lower probability of establishment in higher transmission settings suggests that higher transmission levels increase the heterogeneity in parasite reproductive success, reducing the chance to transmit advantageous mutations. Two factors increase the heterogeneity of parasite reproductive success in settings with a high EIR. First, in higher transmission settings, there is higher variability in the number of parasites with distinct genotypes carried by a host and which are competing for reproductive success. Thus, the greater variability of within-host competition between hosts leads to greater heterogeneity of parasite reproductive success. Second, settings with a high EIR have a large variation in the level of individual immunity. Host immunity influences parasite reproductive success by reducing parasite growth within the human host. Therefore, in high transmission settings, the greater variation of immunity leads to higher heterogeneity of parasite reproductive success and reduces the chance that the emerging mutation will be transmitted despite its advantage.</p><figure itemscope="" itemtype="http://schema.stenci.la/Figure" id="fig4" title="Figure 4."><label data-itemprop="label">Figure 4.</label><stencila-code-chunk itemscope="" itemtype="http://schema.stenci.la/CodeChunk" data-programminglanguage="r"><pre class="language-r" itemscope="" itemtype="http://schema.stenci.la/CodeBlock" slot="text"><code># Load the data Scenario_liste <- read.csv(file = "data/Figure4-Sourcedata1.csv", header = TRUE) # Define setting variable to be a factor Scenario_liste$eir <- factor(Scenario_liste$eir, levels = c("5", "10", "500")) Scenario_liste$Dosage <- factor(Scenario_liste$Dosage, levels = c("1", "0")) Scenario_liste$drug <- factor(Scenario_liste$drug, levels = c("A", "B", "A+B")) # Select the data from the setting that we want show on the plot Scenario_liste_2 <- Scenario_liste[Scenario_liste$eir == 5 | Scenario_liste$eir == 500,] Scenario_liste_2 <- Scenario_liste_2[Scenario_liste_2$Dosage == 1,] # Define label for variable that are a factor D.labs <- c("Adherence = 100 %", "Adherence = 60 %") names(D.labs) <- c("1", "0") E.labs <- c("EIR = 5", "EIR = 10", "EIR = 500") names(E.labs) <- c("5", "10", "500") Dr.labs <- c("Short-acting drug", "Long-acting drug", "Short-acting +\nLong-acting drugs") names(Dr.labs) <- c("A", "B", "A+B") # Define a constant use to adjust size of plot constant<-2.5 # Estimate the 95CI Scenario_liste_2$Pe_L<-Scenario_liste_2$Pe-1.96*sqrt((Scenario_liste_2$Pe*(1-Scenario_liste_2$Pe))/Scenario_liste_2$Number_mutation) Scenario_liste_2$Pe_U<-Scenario_liste_2$Pe+1.96*sqrt((Scenario_liste_2$Pe*(1-Scenario_liste_2$Pe))/Scenario_liste_2$Number_mutation) # Plot the data ggplot(data = Scenario_liste_2) + geom_line(aes(x = Indicator, y = Pe, linetype = eir,color = eir), size = 2 / constant) + geom_ribbon(aes(x = Indicator, ymin = Pe_L, ymax = Pe_U, fill = eir), alpha = 0.2) + facet_grid( ~ drug, scale = "free", labeller = labeller(eir = E.labs, drug = Dr.labs)) + theme_bw() + scale_linetype_manual( values = c("solid", "solid", "twodash"), name = "EIR (inoculations per person per year):", breaks = c("5", "10", "500"), labels = c("5", "10", "500") ) + scale_color_manual( values = c("#CC8E51","#0072B2", "#2C85B2"), # "#009E73","#0072B2", "#D55E00","#56B4E9","#CC79A7" name = "EIR (inoculations per person per year):", breaks = c("5", "10", "500"), labels = c("5", "10", "500") ) + scale_fill_manual( values = c("#CC8E51","#0072B2", "#2C85B2"), # "#009E73","#0072B2", "#D55E00","#56B4E9","#CC79A7" name = "EIR (inoculations per person per year):", breaks = c("5", "10", "500"), labels = c("5", "10", "500") ) + scale_x_continuous(name = "Selection coefficient") + scale_y_continuous(name = "Probability of establishment") + theme( axis.text.x = element_text(size = 16 / constant), axis.text.y = element_text(size = 16 / constant), axis.title.x = element_text(size = 18 / constant, face = "bold"), axis.title.y = element_text(size = 18 / constant, face = "bold"), plot.title = element_text( size = 20 / constant, hjust = 0.5, face = "bold")) + theme(legend.text = element_text(size = 18 / constant)) + theme(legend.title = element_text(size = 18 / constant, face = "bold")) + ggtitle(label = "") + theme( strip.text.x = element_text( size = 18 / constant, color = "black", face = "bold"), strip.text.y = element_text( size = 18 / constant, color = "black", face = "bold")) + theme(plot.margin = unit(c(0.1, 0.1, 0.1, 0.1), "cm")) + guides(linetype = guide_legend(keywidth = 4 / constant, keyheight = 1 /constant)) + theme( legend.position = "top", legend.direction = "horizontal", legend.spacing.y = unit(-5, "cm"), legend.margin = margin(-0.3, -0.3, -0.3, -0.3, unit = "cm"))</code></pre></stencila-code-chunk><figcaption><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="estimated-probability-of-establishment-of-mutations-conferring-drug-resistance-across-transmission-settings">Estimated probability of establishment of mutations conferring drug resistance across transmission settings.</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Solid brown curves and blue dashed curves represent the relationship between the selection coefficient and the estimated probability of establishment of resistant parasites across settings that differ in transmission intensities (5 and 500 inoculations per person per year, respectively). The relationships are illustrated for parasites resistant to the short- and long-acting drugs when each drug was used as monotherapy and parasites resistant to the short-acting drug when both drugs were combined. The shaded area represents the 95% confidence intervals estimated as described in Materials and methods. The range of selection coefficients include higher values at a low entomological inoculation rate (EIR). For each setting, the level of access to treatment was specified as 80%, the population was assumed to be fully adherent to treatment (100%), and transmission was non-seasonal.</p></figcaption></figure><h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="discussion">Discussion</h2><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Understanding which disease, transmission, epidemiological, health system, and drug factors systemically drive the evolution of drug resistance is challenging. A full understanding requires vast observational data or clinical trials on a scale that is not possible or mathematical models that are sufficiently detailed to capture all these factors while remaining computationally feasible to simultaneously assess the impact of these factors. In response to this need, we updated a detailed individual-based model of malaria dynamics to include a full pharmacological (i.e. PK/PD) description of antimalarial treatments. We introduced a global sensitivity analysis approach based on emulators for computationally intensive models to systematically assess which factors jointly drive the evolution of drug-resistant parasites. As discussed below, our approach allowed us to understand the guiding principles of the evolution of drug resistance against ACTs and to explain the difference in trends observed in the GMS and in malaria endemic Africa. Improving our understanding of the factors that lead to drug resistance establishment and spread allows us to identify strategies to mitigate these dynamics and guides initial considerations for developing more sustainable malaria treatment.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our results support the belief that evolution of resistance to ACTs begins with the establishment and spread of parasites resistant to the partner drug and once the protective effect of the partner drug is reduced, drug selection falls on the artemisinin component, and parasites then start to acquire resistance to artemisinin derivatives (e.g. <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib97"><span>97</span><span>Watson et al.</span><span>2021</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib37"><span>37</span><span>Hastings et al.</span><span>2016</span></a></cite>). The fact that resistance to the partner drug appears before resistance to artemisinin derivatives was supported by two points elucidated in our study. First, resistance to the partner drug depends on the period of low concentration of this drug during which only resistant parasites can multiply within the host (known as the selection window). As artemisinin derivatives are short-acting, they cannot prevent patients from being reinfected by parasites resistant to the partner drug during this selection window. Second, resistance to the partner drug was the most critical factor that enhanced establishment and spread of partial artemisinin resistance. Without resistance to the partner drug, parasites partially resistant to artemisinin could only spread at a low rate as the partner drug could still eliminate them, thereby removing their selective advantage. Our results are in line with recent molecular data which show that parasites resistant to partner drugs (piperaquine and mefloquine) were already present in the GMS before partial artemisinin resistance emerged and that the spread of resistance to artemisinin accelerated when it became linked to resistance to the partner drugs <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib1"><span>1</span><span>Amato et al.</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib31"><span>31</span><span>Hamilton et al.</span><span>2019</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib110"><span>110</span><span>Wongsrichanalai and Meshnick</span><span>2008</span></a></cite></span>. Thus, the presence of partner drug resistance has probably facilitated the spread of resistance to artemisinin in the GMS. In contrast, in Africa, to date, only a low degree of resistance to the most commonly used partner drugs (lumefantrine and amodiaquine) are present <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib24"><span>24</span><span>Ehrlich et al.</span><span>2021</span></a></cite></span>, which has likely limited establishment of resistance to artemisinin derivatives. We additionally note that the evolution of drug resistance in the GMS may have been favoured by the low transmission intensity (annual EIR range approximate from less than 1 to 25 inoculations per person per year <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib22"><span>22</span><span>Edwards et al.</span><span>2019</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib13"><span>13</span><span>Chaumeau et al.</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib23"><span>23</span><span>Edwards et al.</span><span>2019</span></a></cite></span>) compare to Africa where the transmission intensity is overall higher (annual EIR range from less than 1 to more than 500 inoculations per person per year <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib39"><span>39</span><span>Hay et al.</span><span>2000</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib111"><span>111</span><span>Yamba et al.</span><span>2020</span></a></cite></span>). Similar to previous studies <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib99"><span>99</span><span>White</span><span>1999</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib9"><span>9</span><span>Bushman et al.</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib72"><span>72</span><span>Pongtavornpinyo et al.</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib57"><span>57</span><span>Lee et al.</span><span>2022</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib32"><span>32</span><span>Hastings</span><span>1997</span></a></cite></span>, establishment of drug resistance in our model was more likely in low transmission settings due to the reduced level of within-host competition between genotypes, as well as population immunity.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our results suggest that a key strategy to mitigate the evolution of partial artemisinin resistance is to ensure that the partner drug efficiently kills the partially resistant parasite. Therefore, to delay the establishment of artemisinin resistance in Africa and to mitigate the spread of partial artemisinin resistance in regions where it is already established, we should ensure that limited or no genotypes are resistant to the partner drug for first-line ACT. One approach to ensure this is to implement robust molecular surveillance of resistance markers and to specify more sustainable treatment policies, such as changing first-line ACTs upon detection of resistance or when the frequency of resistant parasites reach a threshold as recommended by the WHO <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. Furthermore, consistent with our results, adherence should continue to be promoted, as lower treatment compliance can lead to treatment failure even in the absence of resistance to the partner drug <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib79"><span>79</span><span>Siddiqui et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib8"><span>8</span><span>Bruxvoort et al.</span><span>2014</span></a></cite></span>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our results suggest that future antimalarial therapies should shorten the selection windows of long-acting partner drugs. We show that resistance to long-acting drugs is the first step in the evolution of resistance to ACTs, and it depends mainly on the length of the selection window. We confirm that the selection window strongly depends on the drug half-life, also consistent with previous studies <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib99"><span>99</span><span>White</span><span>1999</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib80"><span>80</span><span>Slater et al.</span><span>2017</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib34"><span>34</span><span>Hastings et al.</span><span>2002</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib96"><span>96</span><span>Watkins and Mosobo</span><span>1993</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib72"><span>72</span><span>Pongtavornpinyo et al.</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib47"><span>47</span><span>Kay and Hastings</span><span>2015</span></a></cite></span>. Consequently, reducing the half-life of the partner drug in an ACT regimen could reduce the spread of resistance. However, unless selection windows are substantially minimised or completely eliminated, the evolution of resistance would not totally be prevented <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib47"><span>47</span><span>Kay and Hastings</span><span>2015</span></a></cite>. Thus, a more sustainable option for ACTs would be to use TACTs. TACTs involve combining an artemisinin derivative with two long-acting drugs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib54"><span>54</span><span>Krishna</span><span>2019</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">If or when TACTs are to be widely used, our results emphasise that the two long-acting drugs should have matching half-lives to ensure that parasites are not exposed to residual drug concentrations of only one of the two partner drugs (noting that this is simple in principle, but more difficult in practice <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib36"><span>36</span><span>Hastings and Hodel</span><span>2014</span></a></cite>). In addition, the parasite population should be devoid of parasites resistant to either of the two long-acting drugs. If resistance to one partner drug already exists in the population, the second partner drug would not be protected, and mutations conferring resistance to this second drug could be selected. However, additional forces will play a role in the evolution of resistance to drugs used in TACTs, such as if the drugs combined lead to opposite selection pressure. Additional analyses should assess which factors promote drug resistance under TACTs to guide their development. Note that the development of new partner drugs for TACTs may be challenging because combining three drugs is likely to increase the risk of toxicity and the treatment price, and future antimalarial medicines must remain tolerated by patients and affordable <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib54"><span>54</span><span>Krishna</span><span>2019</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Another approach to delay the evolution of partial artemisinin resistance could focus on extending the period of action of artemisinin derivatives. In our monotherapy analysis on the spread of a genotype partially resistant to artemisinin, we found that the spread of partially resistant genotypes decreased when the drug was present in patients for a longer time, such as if it had a long half-life and there was proper treatment adherence. This result arises because partially resistant parasites are still affected by the drug <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib52"><span>52</span><span>Klonis et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib78"><span>78</span><span>Sá</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib107"><span>107</span><span>Witkowski et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib112"><span>112</span><span>Ye et al.</span><span>2016</span></a></cite></span>. Thus, increasing their exposure to the drug leads to higher killing and reduced spread. Increasing the exposure to artemisinin derivatives can be achieved by using the artemisinin derivative having the longest half-life and, as highlighted in other studies <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib48"><span>48</span><span>Kay et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib20"><span>20</span><span>Dogovski et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib49"><span>49</span><span>Khoury et al.</span><span>2020</span></a></cite></span>, can be done by increasing the number of doses and days that patients receive treatment. However, it is worth noting that extending the dosage regimen will be efficient only with adequate adherence to treatment, which may be challenging to achieve in practice. Also, as artemisinin derivatives are co-administrated with at least one long-acting drug, increasing the number of doses of this combination therapy would require reducing the concentration of the partner drug to prevent the partner drug from reaching toxic concentrations.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The evolution of drug resistance is a three-step process consisting of mutation, establishment, and spread. Mutation rates in malaria can be measured. Spread, quantified by the selection coefficient, is also easy to measure. However, the probability of establishment and its relation to the selection coefficient constituted a significant knowledge gap. Standard population genetic models assume that the number of secondary infections follows a Poisson distribution <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib18"><span>18</span><span>Crow and Motoo</span><span>2017</span></a></cite></span>. Under this assumption, for selection coefficients lower than 0.2 (according to an informal literature review in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>, most selection coefficient estimates for malaria drug resistance mutations from the field fall between 0.02 and 0.12), the probability of establishment is approximately equal to twice the selection coefficient <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib18"><span>18</span><span>Crow and Motoo</span><span>2017</span></a></cite></span>. However, the number of secondary malaria infections more likely follows a negative binomial distribution due to the high heterogeneity of transmission, which may substantially reduce the probability of establishment (Box 2 of <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite>). In this modelling study, we were uniquely able to quantify the link between selection coefficients and the probability of establishment of mutations. On average, we estimated that, for selection coefficients lower than 0.2, the probability of establishment was equal to 0.87 times the selection coefficient. Therefore, our findings suggest that the variation in the number of secondary infections of <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P. falciparum</em> must be much greater than the Poisson distribution assumed by standard population genetics models, and this higher variation reduces the probability of establishment of emerging mutations. Note that higher heterogeneity in parasite reproductive success may exist in the real-world than as simulated in our model due to factors not captured by our model (such as geographical heterogeneity of exposure to mosquito bites). These factors may further decrease the probability of establishment <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib51"><span>51</span><span>Klein</span><span>2014</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">As with all modelling studies, our approach has several limitations, primarily arising from constraints imposed by the model. First, our drug action model does not capture stage-specific killing effects, so we could not model parasites partially resistant to artemisinin being insensitive to the drug only during extended ring-stage <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib52"><span>52</span><span>Klonis et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib78"><span>78</span><span>Sá</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib107"><span>107</span><span>Witkowski et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib112"><span>112</span><span>Ye et al.</span><span>2016</span></a></cite></span>, although previous analyses suggested this would be captured by our variation in the maximum killing rate <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib40"><span>40</span><span>Hodel et al.</span><span>2016</span></a></cite>. Nevertheless, if we modelled a reduction of the drug effect restricted to the ring-stage, we expect to obtain similar results. That is, a long half-life and high treatment adherence would increase the likelihood that the drug is present within patients during any stage other than the ring-stage, and thus the drug would kill more resistant parasites.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Second, our model did not capture the impact of artemisinin resistance on gametocytes. Previous studies have highlighted that artemisinin kills gametocytes, and patients infected with parasites partially resistant to artemisinin exhibit higher gametocyte densities than patients infected with sensitive parasites <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib3"><span>3</span><span>Ashley et al.</span><span>2014</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib108"><span>108</span><span>Witmer et al.</span><span>2020</span></a></cite></span>. We did not model the impact of artemisinin and resistance on gametocytes. This effect is likely to accelerate the spread of partial resistance. However, the relationship between the different factors reported in this study should be unchanged.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Third, our model, OpenMalaria, does not capture the recombination of <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P. falciparum</em> parasites in mosquitoes (it does not track different genotypes in mosquitoes, and the genotype of a new infections is based on the genotype frequency in humans). In practice, this means we can only investigate the spread of resistance at one locus at a time (because if there is no genetic variability at other loci, then the lack of recombination has no impact). Our results, therefore, apply to the case when resistance is already fixed for one drug before resistance starts to spread to the second; we cannot model the simultaneous spread of resistance to two or more drugs. Moreover, the resistant genotype had a fixed degree of resistance across the simulation and could not acquire additional mutations that provide higher degrees of resistance. Nevertheless, by varying the degree of resistance in our analysis, we were able to assess the changing pattern of selection that occurred with increasing degrees of resistance. The impact of recombination when genetic variability does exist at more than one locus involved in resistance has been investigated previously by simpler genetic models whose main results are as follows. When multiple mutations are needed to confer drug resistance, recombination can slow the spread of drug resistance by separating these mutations <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib32"><span>32</span><span>Hastings</span><span>1997</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib21"><span>21</span><span>Dye and Williams</span><span>1997</span></a></cite></span>. Resistance to some partner drugs requires multiple mutations <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib104"><span>104</span><span>WHO</span><span>2020</span></a></cite>. Partial artemisinin resistance is caused by a mutation in a single gene, but recombination may still impact its spread by separating this mutation from mutations that can minimise the fitness cost associated with resistance <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib86"><span>86</span><span>Stokes et al.</span><span>2021</span></a></cite>. Recombination is more likely to impact the spread of resistant parasites in high transmission settings where recombination between different parasite genotypes is more likely. In addition, the impact of recombination depends on the frequencies of mutations involved in the resistant phenotype <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib21"><span>21</span><span>Dye and Williams</span><span>1997</span></a></cite>. When their frequencies are low, recombination will have a stronger effect as resistant parasites are more likely to recombine with sensitive parasites leading to the separation of these mutations. When their frequencies are high, the impact of recombination is reduced as resistant parasites are more likely to recombine with resistant parasites. A consequence of not including recombination is that in high transmission settings, we have probably overestimated the probability of establishment of resistant parasites that have multiple mutations involved in the drug-resistant phenotype. This means that the difference between the probabilities of establishment in low and high transmission settings is likely greater than reported here. In addition, we may have overestimated the spread of these resistant parasites when these mutations are present in low frequencies.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Lastly, to investigate the establishment of drug-resistant parasites, we modelled the emergence of mutations through importation. Consequently, our estimations represent the establishment of mutations imported into a population or mutations emerging in mosquitoes (assuming that the mosquito has only transmitted the mutated genotype and not the wild type genotype to the individual). A mutation emerging during the blood-stage within the human host may have a lower probability of establishment because sensitive parasites would be present in the host, leading to competition between them. It is still unclear whether mutations conferring drug resistance arise during the blood-stage (due to the high parasite numbers) or during the sexual stage in mosquitoes (because recombination generates many genetic variations). Nevertheless, the probabilities of establishment estimated in this study are consistent with the probabilities of establishment estimated by a previous study <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">In summary, our results confirm that mutations conferring malaria drug resistance are more likely to establish in low transmission settings. Our results demonstrate that the establishment and spread of resistance to artemisinin derivatives have likely been facilitated by pre-existing resistance to partner drugs. Thus, it is essential to prioritise monitoring and to limit the spread of resistance to partner drugs in current or future ACT regimens. If resistance to the partner drug is confirmed, response strategies should prioritise monitoring molecular markers and treatment failure and switching to an ACT with an effective partner drug should be considered. In addition, our results show that drug properties play an essential role in the evolution of drug resistance. Thus, the ongoing development of new antimalarial combinations should limit selection windows of partner drugs by matching half-lives, hopefully leading to longer lasting combination treatments against malaria. In the medium-term, for existing ACTs, it would be advantageous to increase the time of parasite exposure to the short-acting artemisinin derivate and/or to include a second long-acting partner drug with a matching half-life to the other long-acting partner drug (triple ACTs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib54"><span>54</span><span>Krishna</span><span>2019</span></a></cite>) and for which limited or no parasite resistance exists in the target population.</p><h2 itemscope="" itemtype="http://schema.stenci.la/Heading" id="materials-and-methods">Materials and methods</h2><h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="simulation-model-and-the-parameterisation-of-treatment-profiles-and-resistant-genotypes">Simulation model and the parameterisation of treatment profiles and resistant genotypes</h3><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="overview-of-our-openmalaria-model">Overview of our OpenMalaria model</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Our individual-based model, OpenMalaria, simulates the dynamics of <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P. falciparum</em> in humans and links it to a periodically forced deterministic model of <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P. falciparum</em> in mosquitoes <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib16"><span>16</span><span>Chitnis et al.</span><span>2012</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib81"><span>81</span><span>Smith et al.</span><span>2006</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib83"><span>83</span><span>Smith et al.</span><span>2008</span></a></cite></span>. The model structure and fitting are described in detail elsewhere <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib81"><span>81</span><span>Smith et al.</span><span>2006</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib83"><span>83</span><span>Smith et al.</span><span>2008</span></a></cite></span>, including open-access code (<a href="https://github.com/SwissTPH/openmalaria" itemscope="" itemtype="http://schema.stenci.la/Link">https://github.com/SwissTPH/openmalaria</a>) and documentation (<a href="https://github.com/SwissTPH/openmalaria/wiki" itemscope="" itemtype="http://schema.stenci.la/Link">https://github.com/SwissTPH/openmalaria/wiki</a>), and a recently published manuscript provides a new calibration <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib73"><span>73</span><span>Reiker et al.</span><span>2021</span></a></cite>. Here, we have summarised the main components of OpenMalaria and its latest developments in version 40.1, which enabled us to model the establishment and spread of drug-resistant parasites.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">OpenMalaria includes multiple sub-models in which mosquito and infection events, parasite, and human attributes are updated every 5 days. A demography component maintains a constant human population size and age structure across the simulation. Multiple parasite genotypes and their initial frequency can be defined in more recent model versions. For each infection, a mechanistic model simulates the parasite dynamics within the host and incorporates innate, variant, and acquired immunity <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib70"><span>70</span><span>Molineaux et al.</span><span>2002</span></a></cite>. The within-host model allows for concurrent infection of multiple parasite genotypes within the same host and captures indirect competition between genotypes based on host immunity, which regulates the overall parasite load. The user can specify a reduction of the within-host multiplication factors of each genotype to model a fitness cost associated with the mutation. The host’s parasite density determines the symptoms and mortality of patients and diagnostic test results. The occurrence and severity of patient symptoms depend on their pyrogenic threshold, which increases (until saturation) with recent parasite exposure and decays over time <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib82"><span>82</span><span>Smith et al.</span><span>2006</span></a></cite>. Severe episodes of malaria occur due to a high parasite density or due to co-morbidities <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib76"><span>76</span><span>Ross et al.</span><span>2006</span></a></cite>. Malaria mortality can be a consequence of a severe episode or an uncomplicated episode with co-morbidity <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib76"><span>76</span><span>Ross et al.</span><span>2006</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib77"><span>77</span><span>Ross and Smith</span><span>2006</span></a></cite></span>. The model also takes into account neonatal deaths <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib76"><span>76</span><span>Ross et al.</span><span>2006</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib77"><span>77</span><span>Ross and Smith</span><span>2006</span></a></cite></span>. Immunity to asexual parasites prevents severe cases by decreasing the parasite multiplication rate within the host. Individual immunity depends on the cumulative parasite and infection exposure frequency, as well as maternal immunity in infants for several months <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib65"><span>65</span><span>Maire et al.</span><span>2006</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The case management component of OpenMalaria describes the use of treatment for uncomplicated and severe cases and depends on access to health services and whether patients have previously been treated for the same episode <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib89"><span>89</span><span>Tediosi et al.</span><span>2006</span></a></cite>. The disease model includes explicit PK/PD models that capture the process whereby drugs reduce the parasite multiplication rate in treated hosts <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Bertrand and Mentré</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite></span>. Pharmacodynamics parameters are parameterised individually for each genotype to allow different degrees of drug susceptibility to be modelled.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The entomological component of OpenMalaria simulates the mosquito vector feeding behaviours and tracks the infectious status of mosquitoes <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib16"><span>16</span><span>Chitnis et al.</span><span>2012</span></a></cite>. The periodicity of this model allows seasonal patterns of transmission to be captured. The probability that a feeding mosquito becomes infected depends on the parasite density within bitten individuals <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib75"><span>75</span><span>Ross et al.</span><span>2006</span></a></cite>. No recombination is modelled between the different genotypes in the mosquitoes. The number of newly infected hosts depends on the simulated EIR of the vector model <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib16"><span>16</span><span>Chitnis et al.</span><span>2012</span></a></cite>. The genotype of new infections is based on the genotype frequencies in humans from the previous five time steps <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib75"><span>75</span><span>Ross et al.</span><span>2006</span></a></cite>.</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="parameterisation-of-the-treatment-profiles">Parameterisation of the treatment profiles</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">This study investigated factors influencing the establishment and spread of parasites resistant to three different treatment profiles.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The first treatment profile modelled was a short-acting drug administered as monotherapy. The short-acting drug has a short half-life and a high killing efficacy, simulating artemisinin derivatives (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1A and B</a>). We modelled the pharmacokinetics of the short-acting drug using a one-compartment model, which is considered sufficient when modelling short-acting antimalarials <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite></span>. We varied key PK/PD parameters (half-life, EC50, Emax) in the global sensitivity analysis to assess their influence on the rate of spread of resistance. The EC50 ranged from 0.0016 to 0.009 mg/l to include the EC50 of artemether, artesunate, and dihydroartemisinin <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite></span>. The half-life parameter ranges represented the values for artemether, artesunate, and dihydroartemisinin used by <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite> (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>). Note that in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>, the Emax of all short-acting drugs was equal to 27.6 per day. However, we varied the killing rate and included higher values to investigate its effects on the rate of spread (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>). To ensure that the short-acting drug killed the sensitive parasites efficiently for any combination of parameters, we extended the treatment course from a daily drug dose for 3 days to a daily drug dose for 6 days. Moreover, we parameterised the dosage and constant parameter values to that for dihydroartemisinin (<a href="#app1table1" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—table 1</a>), as it is the artemisinin derivate with the shortest elimination half-life and highest EC50 <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite></span>. By doing so, we also ensured that the short-acting drug had the typical profile of an artemisinin derivative.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The second treatment profile modelled was a long-acting drug administered as monotherapy. The long-acting drug had a long half-life and a lower Emax than the short-acting drug (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1A and B</a>), typical of partner drugs used for ACTs. We modelled the PK of the long-acting drug with a two-compartment model, which is more typical of the clinical PK of partner drugs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib5"><span>5</span><span>Bertrand and Mentré</span><span>2008</span></a></cite>. As for the short-acting drug, key PK/PD parameters (half-life, EC50, Emax, and dosage) were varied in the global sensitivity analysis. The EC50 ranged from 0.01 to 0.03 mg/l to include the EC50 of mefloquine, piperaquine, and lumefantrine used by <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>. The half-life range corresponded to the value reported for mefloquine, piperaquine, and lumefantrine in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib12"><span>12</span><span>Charles et al.</span><span>2007</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib85"><span>85</span><span>Staehli Hodel et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib44"><span>44</span><span>Jullien et al.</span><span>2014</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib45"><span>45</span><span>Karunajeewa et al.</span><span>2008</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib64"><span>64</span><span>Maganda et al.</span><span>2015</span></a></cite> (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>). We increased the Emax range from 3.45 per day (as reported in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>) to 5.00 per day to investigate the effect on the rate of spread (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>). We also assessed the impact of Cmax on the rate of spread for the long-acting drug because the Cmax varies between ACTs partner drugs and has a strong influence on the post-treatment killing effect of the long-acting drug <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib36"><span>36</span><span>Hastings and Hodel</span><span>2014</span></a></cite>. We varied drug dosage from 30mg/kg to 40 mg/kg to examine the influence of variation of Cmax on the spread rate for the long-acting drug. The lower limit of 30 mg/kg was fixed to ensure that the long-acting drug killed the sensitive genotype efficiently for any parameter combination. The treatment course involved a daily drug dose for three consecutive days. To ensure that the long-acting drug had the profile of typical partner drugs, the values of the constant parameters were parameterised to the values of piperaquine reported in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib85"><span>85</span><span>Staehli Hodel et al.</span><span>2013</span></a></cite> (<a href="#app1table2" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—table 2</a>).</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The last treatment profile was a combination of short- and long-acting drugs, simulating ACT. We tracked the concentration of each drug independently. We used the same models, parameter values and ranges for the two drugs as when both drugs were used as monotherapy. However, the treatment course involved a daily dose of both drugs for 3 days, as recommended by the WHO for most ACTs <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib105"><span>105</span><span>WHO</span><span>2021</span></a></cite>. In OpenMalaria, the killing effects of the two drugs were calculated independently and acted simultaneously on the parasites.</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="parameterisation-of-the-drug-resistant-genotypes">Parameterisation of the drug-resistant genotypes</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">For each simulation, we tracked two genotypes, one drug-resistant and one drug-sensitive. We investigated the spread of resistant parasites with different degrees of resistance (<a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>). We modelled the phenotype of drug resistance and the degree of resistance differently for each drug profile.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Previous studies have shown that parasites partially resistant to artemisinin exhibit an extended ring-stage during which they are not sensitive to artemisinin (even at high drug concentrations) but remain sensitive to the drug during other stages of the blood replication cycle <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib52"><span>52</span><span>Klonis et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib95"><span>95</span><span>Wang et al.</span><span>2017</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib78"><span>78</span><span>Sá</span><span>2018</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib107"><span>107</span><span>Witkowski et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib112"><span>112</span><span>Ye et al.</span><span>2016</span></a></cite></span>. OpenMalaria does not model the specific drug-killing effect for the different steps of the blood-stage. As in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib59"><span>59</span><span>Lohy Das et al.</span><span>2017</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib60"><span>60</span><span>Lohy Das et al.</span><span>2018</span></a></cite>, we assumed that parasites resistant to the short-acting drug had a reduced Emax compared with sensitive ones (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1B</a>). This assumption captured the fact that, overall, the short-acting drug killed fewer resistant parasites than sensitive ones at any drug concentration because they are not sensitive to artemisinin during the ring-stage and that this stage-specific effect is best incorporated into PK/PD modelling by variation in Emax <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib40"><span>40</span><span>Hodel et al.</span><span>2016</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Previous studies reported that parasites resistant to long-acting drugs typically have an increased EC50 <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib11"><span>11</span><span>Chaorattanakawee et al.</span><span>2016</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib10"><span>10</span><span>Chaorattanakawee et al.</span><span>2015</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib87"><span>87</span><span>Tahita et al.</span><span>2015</span></a></cite></span>. Thus, as in other models, we defined parasites resistant to the long-acting drug to have a higher EC50 than the sensitive ones (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1B</a>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite>; <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite>). With an increased EC50, the resistant parasites were less susceptible to the drug at low drug concentrations. Thus, these resistant genotypes were more likely to survive drug treatment and are more likely to successfully infect new hosts with higher residual drug concentrations <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib47"><span>47</span><span>Kay and Hastings</span><span>2015</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Considering short- and long-acting drugs in combination, the resistant genotype was resistant to the short-acting drug. But in the global sensitivity analysis, both the sensitive and resistant genotypes could have some degree of resistance to the long-acting drug. The decreased susceptibility to the long-acting drug was the same for both sensitive and resistant genotypes, meaning that we assumed the two genotypes differed only in one mutation, which conferred resistance to the short-acting drug. This assumption allowed us to ignore the effect of recombination in the mosquitoes. In effect, this assumed that the allele defining the degree of resistance to the long-acting drug was fixed in the population.</p><h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="approach-to-identify-the-key-drivers-of-the-spread-of-drug-resistant-parasites">Approach to identify the key drivers of the spread of drug-resistant parasites</h3><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Through global sensitivity analyses, we quantified how the factors in <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a> influenced the spread of drug-resistant parasites for each treatment profile. First, we estimated the effect of each factor in a non-seasonal setting with a population fully adherent to treatment. Based on these results, we identified specific settings for further analysis, which used constrained sensitivity analyses to investigate the impact of varying drug properties and fitness costs in a fixed set of settings (i.e. in low and high transmission settings, with low and high treatment levels of monotherapy or combination therapy) and with a fixed degree of resistance. In these additional constrained sensitivity analyses, we also investigated the effect of drivers in seasonal transmission settings (based on the seasonality pattern of a setting in Tanzania [<cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib66"><span>66</span><span>Maire et al.</span><span>2006</span></a></cite>, <a href="#app1fig2" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figure 2</a>]) and where populations adhere to either 100 or 67% of treatment doses.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Due to the number of factors investigated, each global sensitivity analysis required a large number of simulations (see details below) that is computationally infeasible for detailed individual-based models. Therefore, we trained an HGP <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib6"><span>6</span><span>Binois and Gramacy</span><span>2021</span></a></cite> on a limited set of OpenMalaria simulations (3500–11,500 simulations). We then used the trained emulator to predict the output of OpenMalaria for a large number of simulations and used these outputs to perform the global sensitivity analysis (<a href="#fig1" itemscope="" itemtype="http://schema.stenci.la/Link">Figure 1C</a>), adapting a similar approach to <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib28"><span>28</span><span>Golumbeanu et al.</span><span>2022</span></a></cite> and <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib73"><span>73</span><span>Reiker et al.</span><span>2021</span></a></cite>. Our approach involved: (i) randomly sampling combinations of parameters; (ii) simulating and estimating the rate of spread of the resistant genotype for each parameter combination in OpenMalaria; (iii) training an HGP to learn the relationship between the input (for the different drivers) and output (the rate of spread) with iterative improvements to fitting through adaptive sampling; and (iv) performing a global sensitivity analysis based on the Sobol variance decomposition using the trained emulator <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib50"><span>50</span><span>Kilian et al.</span><span>2000</span></a></cite>. Each step of the workflow is detailed below.</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="random-sample-combinations-of-parameters">Random sample combinations of parameters</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We randomly sampled 250 different parameter combinations from the parameter space shown in <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a> using an LHS algorithm <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib29"><span>29</span><span>Gramacy</span><span>2007</span></a></cite>. The parameter ranges were defined as follows. We defined the ranges for the properties of the short-acting drug and the long-acting drug to include the typical parameter values of artemisinin derivatives and long-acting partner drugs, respectively <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib46"><span>46</span><span>Kay et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib106"><span>106</span><span>Winter and Hastings</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib12"><span>12</span><span>Charles et al.</span><span>2007</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib85"><span>85</span><span>Staehli Hodel et al.</span><span>2013</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib44"><span>44</span><span>Jullien et al.</span><span>2014</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib45"><span>45</span><span>Karunajeewa et al.</span><span>2008</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib64"><span>64</span><span>Maganda et al.</span><span>2015</span></a></cite></span>. The range of the degree of resistance captured the spread of drug-resistant parasites, which vary from fully sensitive to having almost no drug sensitivity. The fitness costs were extracted from studies investigating the decline of chloroquine-resistant parasites after the drug pressure was removed <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib55"><span>55</span><span>Kublin et al.</span><span>2003</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib69"><span>69</span><span>Mita et al.</span><span>2003</span></a></cite></span>. The variation in annual EIR captured settings with low transmission to those with high transmission. The range of access to treatment captured settings with low to high level of access to treatment. The variation in the diagnostic detection limit captured the range of sensitivity of typical diagnostics used for malaria (such as rapid diagnostic test, microscopy, and PCR) <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib50"><span>50</span><span>Kilian et al.</span><span>2000</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib71"><span>71</span><span>Murray et al.</span><span>2008</span></a></cite></span>.</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="simulate-and-estimate-the-rate-of-spread-of-the-drug-resistant-genotype">Simulate and estimate the rate of spread of the drug-resistant genotype</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We quantified the rate of spread through the selection coefficient, a measure widely used in population genetics to assess the strength of selection on a genotype <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>. The selection coefficient is the rate at which the logit of the resistant genotype frequency increases each parasite generation and should be linear throughout the spread <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>. Population genetics theory often assumes an infinite population size to remove stochastic fluctuation of the allele frequency also called genetic drift <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>. However, in our model the parasite population size is finite, so stochastic fluctuations are present. Thus, we should avoid estimating the selection coefficient when there is a low frequency of the resistant genotype (from a small human population size, a low EIR, and a small initial frequency of the resistant genotype) because the resistant genotype may become extinct due to the stochastic fluctuation. In addition, the effects of genetic drift that occurs when a genotype is present at a low frequency may cause non-linearity during resistance spread which may obscure the estimation of the selection coefficient <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Following the approach described in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>, we assumed an initial percentage of infected humans carrying the resistant genotype of 50%. A high initial percentage minimises the impact of random fluctuation on our estimation, and the subsequent risk of extinction, without affecting our estimate because the selection coefficient was not frequency-dependent (<a href="#app1fig3" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figure 3</a>). We simulated the spread of resistant parasites in a human population of 100,000 individuals with an age structure typical of some countries in Africa (17.7% of people under 5 years of age) <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib25"><span>25</span><span>Ekström et al.</span><span>2016</span></a></cite>. We ran each parameter combination on five stochastic realisations. The simulation started with a burn-in period of 100 years to reach the expected level of immunity in the population and an additional 30 years to reach EIR equilibrium (<a href="#app1fig4" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figure 4</a>). Both genotypes were sensitive to the drug during this period, so the percentage of infected humans carrying the resistant genotype remained stable. After the burn-in period, we introduced the fitness cost and the drug for which the resistant genotype had reduced sensitivity. We then estimated the selection coefficient, <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">s</em>, as,</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="\mathit{s}=\frac{1}{\mathbf{t}}\left(\mathit{ln}\left(\frac{\mathit{p}\left(\mathit{t}+1\right)}{1-\mathit{p}\left(\mathit{t}+1\right)}\right)-\mathit{ln}\left(\frac{\mathit{p}\left(1\right)}{1-\mathit{p}\left(1\right)}\right)\mathit{}\right)=\frac{1}{12}\left(\mathit{l}\mathit{n}\left(\frac{\mathit{p}\left(13\right)}{1-\mathit{p}\left(13\right)}\right)-\mathit{l}\mathit{n}\left(\frac{\mathit{p}\left(1\right)}{1-\mathit{p}\left(1\right)}\right)\mathit{}\right),"><span class="mjx-mrow" aria-hidden="true"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">s</span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 0.7em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 0.7em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 0.7em; bottom: -0.73em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-B" style="padding-top: 0.298em; padding-bottom: 0.372em;">t</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 0.7em;" class="mjx-line"></span></span><span style="height: 2.098em; vertical-align: -0.73em;" class="mjx-vsize"></span></span><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 5.433em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 5.433em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">+</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 5.433em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">+</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 5.433em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 3.878em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 3.878em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 3.878em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 3.878em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-texatom MJXc-space1"><span class="mjx-mrow"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 1.2em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 1.2em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 1.2em; bottom: -0.756em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">12</span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 1.2em;" class="mjx-line"></span></span><span style="height: 2.124em; vertical-align: -0.756em;" class="mjx-vsize"></span></span><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span></span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 4.378em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 4.378em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">13</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 4.378em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">13</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 4.378em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span></span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 3.878em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 3.878em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 3.878em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 3.878em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-texatom MJXc-space1"><span class="mjx-mrow"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space1"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">where <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">p</em>(<em itemscope="" itemtype="http://schema.stenci.la/Emphasis">t</em>) is the frequency of the resistant genotype in inoculations (the number of inoculations carrying the resistant genotype divided by the total number of inoculations resistant and sensitive genotypes), <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">t</em> is the number of parasite generations after introducing the new drug at <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">t</em>=0. We assumed that a parasite generation is 2 months (60 days) as in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>. We started the regression at one parasite generation after introducing the new drug (at 60 days). We stopped the regression 12 generations later, at 720 days, because, as shown in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>, it was computationally convenient and returned stable selection coefficient estimates. The regression was stopped sooner if the frequency of inoculations carrying the resistant genotype was higher than 90% or lower than 30% to prevent tracking a small number of a single genotype for which genetic drift is strong. In seasonal settings, the rate of spread of the resistant genotype varied throughout the year. Consequently, we estimated the selection coefficient using a moving average of the frequency of the resistant genotype in inoculations (<a href="#app1fig5" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figure 5</a>). This method prevented biasing the selection coefficient according to the period included in the regression.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Once the selection coefficient was estimated, it could be converted to the number of parasite generations needed for the frequency of the resistant genotype in inoculations to increase from <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">p(1</em>) to <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">p(t</em>),</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="\mathit{t}=\frac{1}{\mathbf{s}}\left(\mathit{l}\mathit{n}\left(\frac{\mathit{p}\left(\mathit{t}+1\right)}{1-\mathit{p}\left(\mathit{t}+1\right)}\right)-\mathit{l}\mathit{n}\left(\frac{\mathit{p}\left(1\right)}{1-\mathit{p}\left(1\right)}\right)\mathit{}\right)."><span class="mjx-mrow" aria-hidden="true"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 0.7em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 0.7em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 0.7em; bottom: -0.717em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-B" style="padding-top: 0.151em; padding-bottom: 0.372em;">s</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 0.7em;" class="mjx-line"></span></span><span style="height: 2.084em; vertical-align: -0.717em;" class="mjx-vsize"></span></span><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span></span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 5.433em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 5.433em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">+</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 5.433em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">+</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 5.433em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">l</span></span></span></span><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 3.878em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 3.878em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 3.878em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-texatom MJXc-space2"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-main-I" style="padding-top: 0.225em; padding-bottom: 0.446em;">p</span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 3.878em;" class="mjx-line"></span></span><span style="height: 2.68em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-texatom MJXc-space1"><span class="mjx-mrow"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space1"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.372em;">.</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We could then convert the number of parasite generations to time in years, a more relevant public health measure than the selection coefficient itself.</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="train-the-emulator-and-improve-its-accuracy">Train the emulator and improve its accuracy</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We randomly split our data into a training dataset containing 80% of simulations and a test dataset containing 20% of simulations. We trained the HGP on the training dataset using the function mleHetGPfrom the R package ‘hetGP’ <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib6"><span>6</span><span>Binois and Gramacy</span><span>2021</span></a></cite>. We chose to use HGP as it was successfully used in two previous studies that performed global sensitivity analyses of OpenMalaria <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib73"><span>73</span><span>Reiker et al.</span><span>2021</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib28"><span>28</span><span>Golumbeanu et al.</span><span>2022</span></a></cite></span>. In addition, <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib73"><span>73</span><span>Reiker et al.</span><span>2021</span></a></cite> tested different emulators and found that HGP provided the best fit with a limited number of simulations (analysis not shown in the published study). To assess the accuracy of the emulator, for the test dataset we assessed the correlation coefficient and root mean squared error between selection coefficients estimated with the emulator and selection coefficients estimated using OpenMalaria. We iteratively improved the accuracy of our emulator through adaptive sampling. Adaptive sampling involved resampling 100 parameter combinations in the parameter space where we were less confident (higher variation) in the HGP prediction and repeating the entire process until the emulator had a satisfactory level of accuracy. The satisfactory level of accuracy was defined based on the correlation coefficient and the root means squared error between the estimated selection coefficient and expected selection coefficient for the test dataset (<a href="#app1fig6" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figures 6</a>–<a href="#app1fig12" itemscope="" itemtype="http://schema.stenci.la/Link">!number(12)</a>).</p><h4 itemscope="" itemtype="http://schema.stenci.la/Heading" id="global-sensitivity-analysis">Global sensitivity analysis</h4><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Using the emulator, we undertook global sensitivity analyses using Sobol’s method <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib84"><span>84</span><span>Sobol</span><span>2001</span></a></cite>. This method attributed fractions of the selection coefficient variance to each input <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib84"><span>84</span><span>Sobol</span><span>2001</span></a></cite>. To do this, we first generated two random datasets with a sample size of 100,000 using an LHS algorithm <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib29"><span>29</span><span>Gramacy</span><span>2007</span></a></cite> that sampled within the parameter ranges of <a href="#table1" itemscope="" itemtype="http://schema.stenci.la/Link">Table 1</a>. When then estimated selection coefficients for these datasets with the trained emulators. Note that without emulators, we would have to run these simulations in OpenMalaria, which would not have been feasible due to computational requirements. We then used the function soboljansen from the R package ‘sensitivity’ to perform the global sensitivity analysis with 150,000 bootstrap replicates and the two datasets <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib15"><span>15</span><span>Cheng et al.</span><span>2021</span></a></cite>. With this function, we estimated first-order and total Sobol' indices simultaneously. The first-order indices represent contributions of each parameter’s main effect to the model output variance. The total effect represents the contribution of each parameter to the model output variance considering their interactions with other factors. We report only the first-order indices in the Results section because we did not observe many interactions between these factors. Some parameters supported the spread of resistance (increased the selection coefficient), whilst others hindered the spread (decreased the selection coefficient). To visualise the direction of the effect of each parameter, we calculated the 25th, 50th, and 75th quantiles of the estimated selection coefficient of the two random datasets over the corresponding parameter ranges.</p><h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="establishment-of-drug-resistance">Establishment of drug resistance</h3><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">As explained in the Introduction, the establishment of resistant mutations is a stochastic process that depends on the selection coefficient of the mutation and the heterogeneity of parasites reproductive success in the setting, which in turn depends on the transmission level and the health system strength <span itemscope="" itemtype="http://schema.stenci.la/CiteGroup"><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib113"><span>113</span><span>Wiesch et al.</span><span>2011</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib35"><span>35</span><span>Hastings</span><span>2004</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib33"><span>33</span><span>Hastings and Mackinnon</span><span>1998</span></a></cite><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib51"><span>51</span><span>Klein</span><span>2014</span></a></cite></span>. Estimating the probability of establishment requires running many stochastic realisations due to the stochasticity of this step. To be more computationally efficient, we assessed the probability of establishment of a subset of 10 resistant genotypes with a known selection coefficient per setting and treatment profile. Based on the observed relationships between the selection coefficient and the probability of establishment for each treatment profile and setting, we could then extrapolate the probability of establishment of any mutations having a known selection coefficient.</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">To estimate the probability of establishment, we modelled the emergence of resistant genotypes in a fully susceptible parasite population. We used the approach described in <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib38"><span>38</span><span>Hastings et al.</span><span>2020</span></a></cite>, in which resistant infections were imported into the population at a low rate. In OpenMalaria, imported infections have the same frequencies of genotypes as in initialisation, thus we cannot import only resistant infections. Therefore, to import resistant infections in a population infected only by sensitive parasites, we followed the step described below (<a href="#app1fig13" itemscope="" itemtype="http://schema.stenci.la/Link">Appendix 1—figure 13</a>). We first defined a 50% frequency of resistant parasites in infected humans. The simulation started with a burn-in phase of 100 years, during which both genotypes were sensitive to treatment. This meant that the frequency of the resistant parasites was stable (at 50%). In the second phase, we introduced a drug to which resistant parasites were hypersensitive (the drug EC50 was 100 times lower in the resistant genotype than the sensitive one). The second phase ran for 100 years, and once complete, the parasite population was fully susceptible. In the third phase, we imported new infections at a rate low enough to ensure that the previously imported resistant genotype either established or went extinct before a new resistant infection was imported (Appendix 1: section 5.1). The third phase ran until the resistant genotype established (frequency of the resistant genotype in infected humans is equal to 50%).</p><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">The probability of establishment, <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">e</sub></em>, can be estimated based on the average number of resistant infections that are imported until the resistant genotype establishes, <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">N<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">e</sub></em>, as follows (the probability of a successful event can be estimated as one divided by the mean number of independent trials required to achieve the first success <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib19"><span>19</span><span>Dekking et al.</span><span>2005</span></a></cite>),</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="{P}_{e}=\frac{1}{{N}_{e}}."><span class="mjx-mrow" aria-hidden="true"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 1.368em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 1.368em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 1.368em; bottom: -0.924em;"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 1.368em;" class="mjx-line"></span></span><span style="height: 2.291em; vertical-align: -0.924em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.372em;">.</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We simulated 300 stochastic realisations, <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">R</em>, and estimated <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">P<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">e</sub></em>, as,</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="{P}_{e}=\frac{1}{{N}_{e}}=\frac{1}{\left(\sum _{j=1}^{r warning=FALSE}{N}_{m,j}\right)/R}=\frac{r warning=FALSE}{\sum _{j=1}^{r warning=FALSE}{N}_{m,j}},"><span class="mjx-mrow" aria-hidden="true"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 1.368em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 1.368em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 1.368em; bottom: -0.924em;"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 1.368em;" class="mjx-line"></span></span><span style="height: 2.291em; vertical-align: -0.924em;" class="mjx-vsize"></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 12.063em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 12.063em; top: -1.368em;"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span><span class="mjx-denominator" style="width: 12.063em; bottom: -1.889em;"><span class="mjx-mrow"><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size2-R" style="padding-top: 0.961em; padding-bottom: 0.961em;">(</span></span><span class="mjx-munderover"><span class="mjx-base"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size1-R" style="padding-top: 0.519em; padding-bottom: 0.519em;">∑</span></span></span><span class="mjx-stack" style="vertical-align: -0.315em;"><span class="mjx-sup" style="font-size: 70.7%; padding-bottom: 0.255em; padding-left: 0px; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">w</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">a</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.519em; padding-right: 0.003em;">g</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em;">A</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">L</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.026em;">E</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span></span></span></span></span><span class="mjx-msubsup MJXc-space1"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span></span></span></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size2-R" style="padding-top: 0.961em; padding-bottom: 0.961em;">)</span></span></span><span class="mjx-texatom MJXc-space1"><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">/</span></span></span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">R</span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 12.063em;" class="mjx-line"></span></span><span style="height: 3.257em; vertical-align: -1.889em;" class="mjx-vsize"></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mfrac MJXc-space3"><span class="mjx-box MJXc-stacked" style="width: 9.443em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 9.443em; top: -1.511em;"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">w</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">a</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.519em; padding-right: 0.003em;">g</span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mi MJXc-space3"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em;">A</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">L</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.026em;">E</span></span></span></span><span class="mjx-denominator" style="width: 9.443em; bottom: -1.557em;"><span class="mjx-mrow"><span class="mjx-munderover"><span class="mjx-base"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size1-R" style="padding-top: 0.519em; padding-bottom: 0.519em;">∑</span></span></span><span class="mjx-stack" style="vertical-align: -0.315em;"><span class="mjx-sup" style="font-size: 70.7%; padding-bottom: 0.255em; padding-left: 0px; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">w</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">a</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.519em; padding-right: 0.003em;">g</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em;">A</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">L</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.026em;">E</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span></span></span></span></span><span class="mjx-msubsup MJXc-space1"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span></span></span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 9.443em;" class="mjx-line"></span></span><span style="height: 3.069em; vertical-align: -1.557em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">where <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">N<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">m,j</sub></em> is the number of imported resistant infections until the resistant genotype established in run <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">j</em>. Re-arranging the formula shows that <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">Pe</em> is equal to the number of resistant genotypes established in all stochastic realisations (this number is equal to <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">R</em> as only one resistant genotype established per stochastic realisation) divided by the total number of resistant infections imported into all stochastic realisations (includes resistant genotypes that became extinct and established). We estimated the 95% confined intervals of <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">Pe</em> (Wilson methods <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib19"><span>19</span><span>Dekking et al.</span><span>2005</span></a></cite>), as,</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="\left({P}_{e}-1.96\sqrt{\frac{{P}_{e}\left(1-{P}_{e}\right)}{\sum _{j=1}^{r warning=FALSE}{N}_{m,j}}}{,P}_{e}+1.96\sqrt{\frac{{P}_{e}\left(1-{P}_{e}\right)}{\sum _{j=1}^{r warning=FALSE}{N}_{m,j}}}\right)."><span class="mjx-mrow" aria-hidden="true"><span class="mjx-mrow"><span class="mjx-mo" style="vertical-align: -0.888em;"><span class="mjx-delim-v"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.961em; padding-bottom: 0.961em; margin-bottom: -0.103em;">⎛</span><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.961em; padding-bottom: 0.888em; margin-top: -0.103em;">⎝</span></span></span><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1.96</span></span><span class="mjx-msqrt"><span class="mjx-box" style="padding-top: 0.045em;"><span class="mjx-surd"><span class="mjx-delim-v"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.372em; padding-bottom: 0.298em;"></span><span class="mjx-char MJXc-TeX-size4-R" style="line-height: 0.589em; margin-bottom: -0.106em; margin-top: 0.006em;"> </span><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.74em; padding-bottom: 1.182em;">⎷</span></span></span><span class="mjx-box" style="padding-top: 0.149em; border-top: 1px solid;"><span class="mjx-mrow"><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 9.443em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 9.443em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-msubsup MJXc-space2"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 9.443em; bottom: -1.557em;"><span class="mjx-mrow"><span class="mjx-munderover"><span class="mjx-base"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size1-R" style="padding-top: 0.519em; padding-bottom: 0.519em;">∑</span></span></span><span class="mjx-stack" style="vertical-align: -0.315em;"><span class="mjx-sup" style="font-size: 70.7%; padding-bottom: 0.255em; padding-left: 0px; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">w</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">a</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.519em; padding-right: 0.003em;">g</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em;">A</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">L</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.026em;">E</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span></span></span></span></span><span class="mjx-msubsup MJXc-space1"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span></span></span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 9.443em;" class="mjx-line"></span></span><span style="height: 3.148em; vertical-align: -1.557em;" class="mjx-vsize"></span></span></span></span></span></span><span class="mjx-msubsup"><span class="mjx-base"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span><span class="mjx-mi MJXc-space1"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.36em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">+</span></span><span class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1.96</span></span><span class="mjx-msqrt"><span class="mjx-box" style="padding-top: 0.045em;"><span class="mjx-surd"><span class="mjx-delim-v"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.372em; padding-bottom: 0.298em;"></span><span class="mjx-char MJXc-TeX-size4-R" style="line-height: 0.589em; margin-bottom: -0.106em; margin-top: 0.006em;"> </span><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.74em; padding-bottom: 1.182em;">⎷</span></span></span><span class="mjx-box" style="padding-top: 0.149em; border-top: 1px solid;"><span class="mjx-mrow"><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 9.443em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 9.443em; top: -1.59em;"><span class="mjx-mrow"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span><span class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.298em; padding-bottom: 0.446em;">−</span></span><span class="mjx-msubsup MJXc-space2"><span class="mjx-base" style="margin-right: -0.109em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.109em;">P</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span class="mjx-denominator" style="width: 9.443em; bottom: -1.557em;"><span class="mjx-mrow"><span class="mjx-munderover"><span class="mjx-base"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size1-R" style="padding-top: 0.519em; padding-bottom: 0.519em;">∑</span></span></span><span class="mjx-stack" style="vertical-align: -0.315em;"><span class="mjx-sup" style="font-size: 70.7%; padding-bottom: 0.255em; padding-left: 0px; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">w</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">a</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">r</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">n</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.519em; padding-right: 0.003em;">g</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.106em;">F</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em;">A</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">L</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.519em; padding-bottom: 0.298em; padding-right: 0.032em;">S</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.026em;">E</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1</span></span></span></span></span></span></span><span class="mjx-msubsup MJXc-space1"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.519em;">j</span></span></span></span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 9.443em;" class="mjx-line"></span></span><span style="height: 3.148em; vertical-align: -1.557em;" class="mjx-vsize"></span></span></span></span></span></span><span class="mjx-mo" style="vertical-align: -0.888em;"><span class="mjx-delim-v"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.961em; padding-bottom: 0.961em; margin-bottom: -0.103em;">⎞</span><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 0.961em; padding-bottom: 0.888em; margin-top: -0.103em;">⎠</span></span></span></span><span class="mjx-mo MJXc-space1"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.372em;">.</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">Note that in each stochastic realisation, we estimated <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">N<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">m</sub></em>, as,</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="{N}_{m}={t}_{e}{N}_{i},"><span class="mjx-mrow" aria-hidden="true"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span></span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-msubsup MJXc-space3"><span class="mjx-base"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em;">i</span></span></span></span></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">where <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">t<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">e</sub> is</em> defined as the last time that the number of infections with a resistant genotype was equal to zero, that is the time (in years) until the arrival of the imported resistant infection that led to the successful establishment of the resistant genotype. <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">N<sub itemscope="" itemtype="http://schema.stenci.la/Subscript">i</sub></em> is the number of imported resistant infections per year. Note that OpenMalaria specifies the number of imported infections, <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">V</em>, in numbers of imported infections per 1000 people per year, and half of the imported infections were sensitive. Thus, the number of imported resistant infections that occurred until one established can be estimated as,</p><span itemscope="" itemtype="http://schema.stenci.la/MathBlock"><span class="mjx-chtml MJXc-display" style="text-align: center;"><span class="mjx-math" aria-label="{N}_{m}={t}_{e}\left(\frac{NV}{2\left(1000\right)}\right)=5{t}_{e}V,"><span class="mjx-mrow" aria-hidden="true"><span class="mjx-msubsup"><span class="mjx-base" style="margin-right: -0.085em;"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">m</span></span></span></span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-msubsup MJXc-space3"><span class="mjx-base"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">(</span></span><span class="mjx-mfrac"><span class="mjx-box MJXc-stacked" style="width: 3.645em; padding: 0px 0.12em;"><span class="mjx-numerator" style="width: 3.645em; top: -1.385em;"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.085em;">N</span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.186em;">V</span></span></span></span><span class="mjx-denominator" style="width: 3.645em; bottom: -1.09em;"><span class="mjx-mrow"><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">2</span></span><span class="mjx-mrow MJXc-space1"><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">(</span></span><span class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">1000</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.446em; padding-bottom: 0.593em;">)</span></span></span></span></span><span style="border-bottom: 1.3px solid; top: -0.296em; width: 3.645em;" class="mjx-line"></span></span><span style="height: 2.475em; vertical-align: -1.09em;" class="mjx-vsize"></span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-size4-R" style="padding-top: 1.551em; padding-bottom: 1.551em;">)</span></span></span><span class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.077em; padding-bottom: 0.298em;">=</span></span><span class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R" style="padding-top: 0.372em; padding-bottom: 0.372em;">5</span></span><span class="mjx-msubsup"><span class="mjx-base"><span class="mjx-texatom"><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.372em; padding-bottom: 0.298em;">t</span></span></span></span></span><span class="mjx-sub" style="font-size: 70.7%; vertical-align: -0.212em; padding-right: 0.071em;"><span class="mjx-texatom" style=""><span class="mjx-mrow"><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.225em; padding-bottom: 0.298em;">e</span></span></span></span></span></span><span class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I" style="padding-top: 0.446em; padding-bottom: 0.298em; padding-right: 0.186em;">V</span></span><span class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R" style="margin-top: -0.144em; padding-bottom: 0.519em;">,</span></span></span></span></span></span><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">where <em itemscope="" itemtype="http://schema.stenci.la/Emphasis">N</em> is the human population size. We simulated a population size of 10,000 individuals to increase computational feasibility for the large number of simulations required for our extensive global sensitivity analyses. A larger population was unnecessary, as the population size does not influence the probability of establishment unless it is extremely small <cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib98"><span>98</span><span>Waxman</span><span>2011</span></a></cite>. This was not the case in our simulation, which had a minimum of 3018 infections in the low transmission setting.</p><h3 itemscope="" itemtype="http://schema.stenci.la/Heading" id="data-and-software-availability">Data and software availability</h3><p itemscope="" itemtype="http://schema.stenci.la/Paragraph">We did not use individual participant-level data. Parameters values used in the model were informed from the literature as referred to in the main text or the Appendix. The source code for OpenMalaria was developed using the C++language and is available at <a href="https://github.com/SwissTPH/openmalaria" itemscope="" itemtype="http://schema.stenci.la/Link">https://github.com/SwissTPH/openmalaria</a><span data-itemtype="http://schema.org/Number">0</span><cite itemscope="" itemtype="http://schema.stenci.la/Cite"><a href="#bib90"><span>90</span><span>Thüring et al.</span><span>2022</span></a></cite>and a documentation is available at <a href="https://github.com/SwissTPH/openmalaria/wiki" itemscope="" itemtype="http://schema.stenci.la/Link">https://github.com/SwissTPH/openmalaria/wiki</a>. The analysis script was developed using the R software and is available at <a href="https://zenodo.org/badge/latestdoi/458217287" itemscope="" itemtype="http://schema.stenci.la/Link">https://zenodo.org/badge/latestdoi/458217287</a>. All data and codes used to produce the figures are available at <a href="https://zenodo.org/badge/latestdoi/458226427" itemscope="" itemtype="http://schema.stenci.la/Link">https://zenodo.org/badge/latestdoi/458226427</a>. 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