West Nile virus (WNV) is a single-stranded RNA virus that causes West Nile fever.It is a member of the family Flaviviridae, specifically from the genus Flavivirus, which also contains the Zika virus, dengue virus, and yellow fever virus. West Nile virus is primarily transmitted by mosquitoes, mostly species of Culex.The primary hosts of WNV are birds, so that the virus remains within a “bird …