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Samuel Ayobami Fasogbon 1 Article
Distribution pattern and prevalence of West Nile virus infection in Nigeria from 1950 to 2020: a systematic review
Idris Nasir Abdullahi, Anthony Uchenna Emeribe, Peter Elisha Ghamba, Pius Omoruyi Omosigho, Zakariyya Muhammad Bello, Bamidele Soji Oderinde, Samuel Ayobami Fasogbon, Lawal Olayemi, Isa Muhammad Daneji, Muhammad Hamis Musa, Justin Onyebuchi Nwofe, Nkechi Blessing Onukegbe, Chukwudi Crescent Okume, Sanusi Musa, Abubakar Muhammad Gwarzo, Odunayo Oyetola Rahmat Ajagbe
Epidemiol Health. 2020;42:e2020071.   Published online November 26, 2020
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  • 4 Crossref
AbstractAbstract PDF
West Nile virus (WNV) is a re-emerging mosquito-borne viral infection. This study investigated the pooled prevalence pattern and risk factors of WNV infection among humans and animals in Nigeria.
A systematic review was conducted of eligible studies published in PubMed, Scopus, Google Scholar, and Web of Science from January 1, 1950 to August 30, 2020. Peer-reviewed cross-sectional studies describing WNV infections in humans and animals were systematically reviewed. Heterogeneity was assessed using the Cochrane Q statistic.
Eighteen out of 432 available search output were eligible and included for this study. Of which 13 and 5 were WNV studies on humans and animals, respectively. Although 61.5% of the human studies had a low risk of bias, they all had high heterogeneity. The South West geopolitical zone of Nigeria had the highest pooled prevalence of anti-WNV immunoglobulin M (IgM; 7.8% in humans). The pooled seroprevalence of anti-WNV IgM and immunoglobulin G (IgG) was 7.1% (95% confidence interval [CI], 5.9 to 8.3) and 76.5% (95% CI, 74.0 to 78.8), respectively. The WNV RNA prevalence was 1.9% (95% CI, 1.4 to 2.9), while 14.3% (95% CI, 12.9 to 15.8) had WNV-neutralizing antibodies. In animals, the pooled seroprevalence of anti-WNV IgM and IgG was 90.3% (95% CI, 84.3 to 94.6) and 3.5% (95% CI, 1.9 to 5.8), respectively, while 20.0% (95% CI, 12.9 to 21.4) had WNV-neutralizing antibodies. Age (odds ratio [OR], 3.73; 95% CI, 1.87 to 7.45; p<0.001) and level of education (no formal education: OR, 4.31; 95% CI, 1.08 to 17.2; p<0.05; primary: OR, 7.29; 95% CI, 1.80 to 29.6; p<0.01) were significant risk factors for WNV IgM seropositivity in humans.
The findings of this study highlight the endemicity of WNV in animals and humans in Nigeria and underscore the need for the One Health prevention and control approach.


Citations to this article as recorded by  
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