A Cohort Study on the Duration of Plasmodium falciparum Infections During the Dry Season in The Gambia.

Collins, KAORCID logo; Ceesay, SORCID logo; Drammeh, S; Jaiteh, FK; Guery, MAORCID logo; Lanke, KORCID logo; Grignard, LORCID logo; Stone, WORCID logo; Conway, DJORCID logo; D'Alessandro, UORCID logo; +2 more...Bousema, TORCID logo; Claessens, AORCID logo and (2022) A Cohort Study on the Duration of Plasmodium falciparum Infections During the Dry Season in The Gambia. The Journal of infectious diseases, 226 (1). pp. 128-137. ISSN 0022-1899 DOI: 10.1093/infdis/jiac116
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BACKGROUND: In areas where Plasmodium falciparum malaria is seasonal, a dry season reservoir of blood-stage infection is essential for initiating transmission during the following wet season. METHODS: In The Gambia, a cohort of 42 individuals with quantitative polymerase chain reaction-positive P falciparum infections at the end of the transmission season (December) were followed monthly until the end of the dry season (May) to evaluate infection persistence. The influence of human host and parasitological factors was investigated. RESULTS: A large proportion of individuals infected at the end of the wet season had detectable infections until the end of the dry season (40.0%; 16 of 40). At the start of the dry season, the majority of these persistent infections (82%) had parasite densities >10 p/µL compared to only 5.9% of short-lived infections. Persistent infections (59%) were also more likely to be multiclonal than short-lived infections (5.9%) and were associated with individuals having higher levels of P falciparum-specific antibodies (P = .02). CONCLUSIONS: Asymptomatic persistent infections were multiclonal with higher parasite densities at the beginning of the dry season. Screening and treating asymptomatic infections during the dry season may reduce the human reservoir of malaria responsible for initiating transmission in the wet season.


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This is an author accepted manuscript version of an article accepted for publication, and following peer review. Please be aware that minor differences may exist between this version and the final version if you wish to cite from it.
Available under Creative Commons: Attribution-NonCommercial-No Derivative Works 4.0

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