Epidemiology and ecology of West Nile virus in sub-Saharan Africa

Parasites & Vectors
Waidi F SuleNicholas Johnson

Abstract

West Nile virus (WNV) is the aetiological agent of the mosquito-borne zoonotic disease West Nile fever. The virus, first isolated in Uganda in 1937, evolved into two distinct lineages in sub-Saharan Africa (SSA) that subsequently spread to most continents where the virus has evolved further as evident through phylogenetic analysis of extant genomes. Numerous published reports from the past 70 years from countries in SSA indicate that the virus is endemic across the region. However, due in part to the limited availability of diagnostic methods across large areas of the continent, the human burden of WNV is poorly understood. So too are the drivers for translocation of the virus from countries south of the Sahara Desert to North Africa and Europe. Migratory birds are implicated in this translocation although the transient viraemia, measured in days, and the time taken to migrate, measured in weeks, suggest a more complex mechanism is in play. This review considers the evidence for the presence of WNV across SSA and the role of migratory birds in the emergence of the virus in other continents.

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Oct 6, 2018·Journal of Travel Medicine·Alan D T Barrett
Jun 27, 2020·Tropical Animal Health and Production·Abdelfattah Selim, Abdelhamed Abdelhady
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Methods Mentioned

BETA
biopsies
enzyme-linked immunosorbent assay
ELISA
biopsy

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