ArticleIJID regions2025
Seroprevalence and associated risk factors of selected arboviruses at Namanga and Mutukula cross-border areas in Tanzania.
Article in IJID regions, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Objectives: Dengue (DENV), Chikungunya (CHIKV), and West Nile (WNV) viruses are among the major mosquito-borne arboviral threats in East Africa. This study assessed seroprevalence and risk factors for DENV, CHIKV, and WNV among residents of Mutukula and Namanga cross borders in Tanzania. Methods: Blood samples were collected from 450 participants and tested using an enzyme-linked immunosorbent assay for anti-viral immunoglobulin G and M (IgG and IgM) antibodies. Descriptive and multivariate logistic regression analyzed risk factors. Results: Overall seroprevalence was 12.4% for DENV, 10.7% for CHIKV, and 10.2% for WNV. Namanga had higher IgM seroprevalences (DENV: 9.7%, CHIKV: 6.9%, and WNV: 6.3%) than Mutukula (DENV: 5.6%, CHIKV: 5.3%, WNV: 5. 9%). IgG seropositivity for CHIKV was linked to a history of travel abroad (adjusted odds ratio [AOR] 7.3, 95% confidence interval [CI] 1.01-54.6), mosquito exposure (AOR 2.8, 95% CI 1.01-7.7), and being female (AOR 6.1, 95% CI 1.3-28). IgM seropositivity was influenced by education, with secondary levels reducing risk (AOR 0.11, 95% CI 0.02-0.64 for DENV; AOR 0.06, 95% CI 0.1-0.6 for CHIKV). Conclusion: This study provides the first evidence of WNV exposure in Tanzania and specific cross-border seroprevalences for DENV and CHIKV transmission. To mitigate the risks, Integrated vector control and enhanced surveillance are highly recommended.
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