West Nile Virus

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The page below is a sample from the LabCE course Mosquito-Borne Viral Diseases. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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West Nile Virus

West Nile virus (WNV) is an arbovirus in the family Flaviviridae. It is the primary cause of arboviral disease in the United States. Approximately 80% of cases are asymptomatic. It is spread by the bite of local mosquitoes. Although WNV is now endemic in most of the US, regional outbreaks can occur at any time.
Figure 24. West Nile Virus - current year data (2024). (2025). Centers for Disease Control and Prevention. https://www.cdc.gov/west-nile-virus/data-maps/current-year-data.html
Figure 25. Public health domain. (2002). Image #10701. This is a digitally-colorized transmission electron microscopic (TEM) image of the West Nile virus (WNV). Centers for Disease Control and Prevention. https://phil.cdc.gov/Details.aspx?pid=10701

Figure 24. West Nile virus cases in the United States in 2024
Figure 25. West Nile virus