Efficacy and safety of artemisinin-based combination therapy, and molecular markers for artemisinin and piperaquine resistance in Mainland Tanzania View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Mwaka A. Kakolwa, Muhidin K. Mahende, Deus S. Ishengoma, Celine I. Mandara, Billy Ngasala, Erasmus Kamugisha, Johannes B. Kataraihya, Renata Mandike, Sigsbert Mkude, Frank Chacky, Ritha Njau, Zul Premji, Martha M. Lemnge, Marian Warsame, Didier Menard, Abdunoor M. Kabanywanyi

ABSTRACT

BACKGROUND: Artemisinin-based combination therapy (ACT) is the first-line anti-malarial treatment of uncomplicated malaria in most malaria endemic countries, including Tanzania. Unfortunately, there have been reports of artemisinin resistance and ACT failure from South East Asia highlighting the need to monitor therapeutic efficacy of ACT in these countries as recommended by World Health Organization. METHODS: Open-label single arm studies in mainland Tanzania were conducted in nine sentinel sites in 2011, 2012 and 2015 to assess the efficacy and safety of artemether/lumefantrine (AL) and artesunate/amodiaquine (ASAQ) using 28 days follow-up and dihydroartemisinin/piperaquine (DHAPQ) using 42 days follow-up. Mutations in the propeller domain of the Plasmodium falciparum kelch 13 (k13) gene and amplification of the P. falciparum plasmepsin 2 (pm2) gene, associated with artemisinin and piperaquine (PQ) resistance, were also investigated. RESULTS: Of the 428 patients enrolled, 328 patients provided study endpoint. For AL, the PCR corrected per-protocol analysis showed adequate clinical and parasitological response (ACPR) of 90.3% (n = 28; 95% CI 74.2-98.0) in Kyela 2012, 95.7% (n = 22; 95% CI 78.1-99.0) in Chamwino, 100% in Muheza (n = 29; 95% CI 88.1-100), 100% in Nagaga (n = 39; 95% CI 91.0-100) and Kyela 2015 (n = 60; 95% CI 94.0-100). For ASAQ, PCR corrected ACPR of 98% (n = 49; 95% CI 89.4-99.9) and 100% (n = 25; 95% CI 86.3-100) were observed in 2011 in Ujiji and Kibaha, respectively. For DHAPQ, the ACPR was 100% (n = 71; 95% CI 94.9-100). Of the 235 samples with genetic interpretable results, only 7 (3%) had non-synonymous k13 mutations. None of these are candidate or validated markers of artemisinin resistance and all patients carrying these alleles cleared the parasites on day 3. Of the DHAPQ group, 10% (3/29) of the samples with interpretable results had pm2 multiple copies and none of them was associated with treatment failure. CONCLUSION: All the tested ACT in mainland Tanzania were highly efficacious and none of validated k13 mutants associated with artemisinin resistance was observed. However, three isolates with multiple copy numbers of pm2 gene associated with PQ resistance among the limited samples tested successfully calls for further investigation. Trial registration Number ACTRN12615000159550. Registered 18th February 2015, https://www.anzctr.org.au/trial/MyTrial.aspx. More... »

PAGES

369

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1186/s12936-018-2524-x

    DOI

    http://dx.doi.org/10.1186/s12936-018-2524-x

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1107685689

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/30333022


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