West Nile virus is a single-stranded RNA virus that causes West Nile fever. It is a member of the family Flaviviridae, from the genus Flavivirus, which also contains the Zika virus, dengue virus, and yellow fever virus. From Wikipedia
UK health officials report first-ever detection of West Nile virus genetic fragments in mosquitoes, while Harris County launches spray operations after identifying its first positive mosquito sample of the year.