Abstract:
:Artemisinin-based combination therapies (ACTs) are first-line treatments for uncomplicated Plasmodium falciparum malaria. ACT resistance is spreading in Asia but not yet in Africa. Reduced effects of ACT partner drugs have been reported but with little information regarding widely used artesunate/amodiaquine (ASAQ). We studied its efficacy in Zanzibar after 14 years as first-line treatment directly by an in vivo, single-armed trial and indirectly by prevalences of different genotypes in the P. falciparum chloroquine-resistance transporter, multidrug-resistance 1, and Kelch 13 propeller domain genes. In vivo efficacy was higher during 2017 (100%; 95% CI 97.4%-100%) than during 2002-2005 (94.7%; 95% CI 91.9%-96.7%) (p = 0.003). Molecular findings showed no artemisinin resistance-associated genotypes and major increases in genotypes associated with high sensitivity/efficacy for amodiaquine than before ASAQ was introduced. Thus, the efficacy of ASAQ is maintained and appears to be increased after long-term use in contrast to what is observed for other ACTs used in Africa.
journal_name
Emerg Infect Disjournal_title
Emerging infectious diseasesauthors
Msellem M,Morris U,Soe A,Abbas FB,Ali AW,Barnes R,Frumento P,Ali AS,Mårtensson A,Björkman Adoi
10.3201/eid2608.191547subject
Has Abstractpub_date
2020-08-01 00:00:00pages
1767-1777issue
8eissn
1080-6040issn
1080-6059journal_volume
26pub_type
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