West Nile Virus Activity by State 2022

About this map

Non-human WNV activity: Indicates that WNV veterinary disease cases or infections in mosquitoes, birds, or sentinel animals have been reported to CDC.

Human WNV infections: Indicates that human WNV disease cases or presumptive viremic blood donors have been reported to CDC. Presumptive viremic blood donors have a positive screening test which has not necessarily been confirmed.

Human and non-human WNV infections: Indicates that both human WNV infections and non-human WNV activity have been reported to CDC.