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Parasite Population Genetic Contributions to the Schistosomiasis Consortium for Operational Research and Evaluation within Sub-Saharan Africa

Webster, J P; Neves, M I; Webster, B L; Pennance, T; Rabone, M; Gouvras, A N; Allan, F; Walker, M; Rollinson, D

Authors

J P Webster

M I Neves

B L Webster

T Pennance

M Rabone

A N Gouvras

F Allan

M Walker

D Rollinson



Abstract

Analyses of the population genetic structure of schistosomes under the “Schistosomiasis Consortium for Operational Research and Evaluation” (SCORE) contrasting treatment pressure scenarios in Tanzania, Niger, and Zanzibar were performed to provide supplementary critical information with which to evaluate the impact of these large-scale control activities and guide how activities could be adjusted. We predicted that population genetic analyses would reveal information on a range of important parameters including, but not exclusive to, recruitment and transmission of genotypes, occurrence of hybridization events, differences in reproductive mode, and degrees of inbreeding, and hence, the evolutionary potential, and responses of parasite populations under contrasting treatment pressures. Key findings revealed that naturally high levels of gene flow and mixing of the parasite populations between neighboring sites were likely to dilute any effects imposed by the SCORE treatment arms. Furthermore, significant inherent differences in parasite fecundity were observed, independent of current treatment arm, but potentially of major impact in terms of maintaining high levels of ongoing transmission in persistent “biological hotspot” sites. Within Niger, naturally occurring Schistosoma haematobium/Schistosoma bovis viable hybrids were found to be abundant, often occurring in significantly higher proportions than that of single-species S. haematobium infections. By examining parasite population genetic structures across hosts, treatment regimens, and the spatial landscape, our results to date illustrate key transmission processes over and above that which could be achieved through standard parasitological monitoring of prevalence and intensity alone, as well as adding to our understanding of Schistosoma spp. life history strategies in general.

Citation

Webster, J. P., Neves, M. I., Webster, B. L., Pennance, T., Rabone, M., Gouvras, A. N., …Rollinson, D. (2020). Parasite Population Genetic Contributions to the Schistosomiasis Consortium for Operational Research and Evaluation within Sub-Saharan Africa. American Journal of Tropical Medicine and Hygiene, https://doi.org/10.4269/ajtmh.19-0827

Journal Article Type Article
Acceptance Date Apr 8, 2020
Publication Date May 12, 2020
Deposit Date May 19, 2020
Publicly Available Date May 19, 2020
Journal The American Journal of Tropical Medicine and Hygiene
Print ISSN 0002-9637
Publisher American Society of Tropical Medicine and Hygiene
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.4269/ajtmh.19-0827
Public URL https://rvc-repository.worktribe.com/output/1377372

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