Efficacy of Artemether-Lumefantrine for the Treatment of Plasmodium falciparum Malaria in Bohicon and Kandi, Republic of Benin, 2018–2019

Augustin Kpemasse Laboratory Service and Chemo Sensitivity, Benin National Malaria Control Program, Cotonou, Benin;

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Fortune Dagnon U.S. President’s Malaria Initiative, U.S. Agency for International Development Benin Office, Cotonou, Benin;

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Ramani Saliou Laboratory Service and Chemo Sensitivity, Benin National Malaria Control Program, Cotonou, Benin;

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Alexis Sacca Yarou Maye Laboratory Service and Chemo Sensitivity, Benin National Malaria Control Program, Cotonou, Benin;

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Cyriaque Dossou Affoukou Laboratory Service and Chemo Sensitivity, Benin National Malaria Control Program, Cotonou, Benin;

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Alassane Zoulkaneri Kandi Health Center, Alibori Department, Benin Ministry of Health, Kandi, Benin;

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Blaise Guézo-Mévo Bohicon Health Center, Zou Department, Benin Ministry of Health, Bohicon, Benin;

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Leah F. Moriarty Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, and the U.S. President’s Malaria Initiative, Atlanta, Georgia;

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Yaye D. Ndiaye Molecular Biology and Genomics Laboratory, Aristide Hospital DANTEC, Dakar, Senegal

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Mamane Nassirou Garba Molecular Biology and Genomics Laboratory, Aristide Hospital DANTEC, Dakar, Senegal

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Awa Bineta Deme Molecular Biology and Genomics Laboratory, Aristide Hospital DANTEC, Dakar, Senegal

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Daouda Ndiaye Molecular Biology and Genomics Laboratory, Aristide Hospital DANTEC, Dakar, Senegal

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Aurore Ogouyemi Hounto Laboratory Service and Chemo Sensitivity, Benin National Malaria Control Program, Cotonou, Benin;

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ABSTRACT.

In 2005, artemether-lumefantrine (AL), an artemisinin-based combination therapy, was introduced as the first-line treatment of uncomplicated Plasmodium falciparum malaria in Benin. Per World Health Organization recommendations to monitor the efficacy of antimalarial treatment, we conducted a therapeutic efficacy study with AL for uncomplicated P. falciparum malaria in Bohicon and Kandi, Benin, from 2018 to 2019. Febrile patients aged 6 to 59 months with confirmed P. falciparum monoinfection received supervised doses of AL for 3 days. We monitored patients clinically and parasitologically on days 1, 2, 3, 7, 14, 21, and 28. A molecular analysis to detect mutations in the P. falciparum Kelch propeller gene (Pfk13) gene was carried out on day 0 samples. A total of 205 patients were included in the study. In Bohicon, the uncorrected adequate clinical and parasitological response (ACPR) proportion was 91.3% (95% confidence interval [CI]: 84.6–95.8%), whereas in Kandi this proportion was 96.7% (95% CI: 90.6–99.3%). Genotype-corrected ACPR proportions were 96.3% (95% CI: 90.9–99.0%) and 96.7% (95% CI: 90.6–99.3%) in Bohicon and Kandi, respectively. On day 3, 100% of patients in Bohicon and 98.9% of patients in Kandi had undetectable parasitemia. The C580Y mutation in the Pfk13 gene was not observed. AL remains effective for P. falciparum malaria in these two sites in Benin. Monitoring antimalarial efficacy and prevalence of molecular-resistance markers in Benin should be continued to allow for early detection of antimalarial resistance and to guide treatment policies.

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Author Notes

Address correspondence to Leah F. Moriarty, Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, and the U.S. President’s Malaria Initiative, 1600 Clifton Rd. NE, Atlanta, GA 30329. E-mail: lmoriarty@cdc.gov

Financial support: Funding for this study was partially provided by the U.S. Agency for International Development through the President’s Malaria Initiative.

Disclaimer: The funding sources for this study had no role in study design, data collection, analysis, or interpretation. The opinions expressed herein are those of the authors and do not necessarily reflect the views of the Benin National Malaria Control Program, U.S. Agency for International Development, or the Centers for Disease Control and Prevention.

Authors’ addresses: Augustin Kpemasse, Programme National de Lutte contre le Paludisme, Laboratory Service and Chemosensitivity, Cotonou, Benin, E-mail: kpemasseaugustin@yahoo.fr. Fortune Dagnon, USAID, Benin, Cotonou, E-mail: lecuredars@yahoo.fr. Ramani Saliou, Alexis Sacca Yarou Maye, Cyriaque Dossou Affoukou, Programme National de Lutte contre le Paludisme, MS, Cotonou, Benin, E-mails: ramani.saliou@yahoo.fr, yarou_alexis@yahoo.fr, and moiacdm@yahoo.fr. Alassane Zoulkaneri, Ministry of Health Benin, Kandi Health Center, Kandi, Benin, E-mail: alphazoul@yahoo.fr. Blaise Guézo-Mévo, Hopital de zone, Département de senté du Mono-Couffo, Comé, Benin, E-mail: guemebla@yahoo.fr. Leah F. Moriarty, Centers for Disease Control and Prevention Center for Global Health, Malaria Branch, Atlanta, GA, E-mail: wvp4@cdc.gov or lmoriarty@cdc.gov. Yaye D. Ndiaye, Awa Bineta Deme, and Daouda Ndiaye, Univerté Cheikh Anta Diop, Parasitologie-Mycologie, Dakar, Senegal, E-mails: ydndiaye@gmail.com, deme.awa@gmail.com, and dndiaye@hsph.harvard.edu. Mamane Nassirou Garba, Hospital DANTEC, Molecular Biology and Genomics Laboratory, Dakar, Senegal, E-mail: nassirou.garba@gmail.com. Aurore Ogouyemi Hounto, Programme National de Lutte contre le Paludisme, Directorate, Cotonou, Benin, E-mail: aurorefel@yahoo.fr.

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