West Nile virus (WNV) is an arbovirus (arthropod borne virus) transmitted by mosquitoes and was first identified in the 1930s in Uganda. In 1999, WNV infections were observed in humans and birds in New York City. Since then, WNV has spread to all states in the continental United States. WNV is not commonly reported in West Virginia residents; however, routine mosquito surveillance in a few West Virginia counties regularly detects the presence of WNV in mosquitoes.
All species of wild birds which are freshly dead (less than 24 hours old) are targeted for active surveillance. Poultry (domestic chickens, ducks, turkeys, geese and guinea fowl) and pet birds will not be submitted for testing. Use the websites below to aid in identifying wild birds.