Where in the United States has West Nile Virus been detected in wildlife?

West Nile Virus has been detected in all conterminous states of the U.S., the District of Columbia, and Puerto Rico. Alaska, Hawaii, and Guam have no reported cases of West Nile virus in humans or animals. Distribution maps are available from the USGS and the Centers for Disease Control.

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Photograph of female mosquito (Aedes japonicus)
2016 (approx.)

A female mosquito (Aedes japonicus) reared from larvae collected from the Kawaikoi Stream, Kauai.

Photograph of a person conducting mosquito sampling on a boardwalk
2016 (approx.)

Researchers dip sampling for mosquitoes along the Alaka‘i Swamp Trail, Kaua‘i

Mosquito trap
May 16, 2016
Image: Biting Mosquito
March 14, 2016

Culex species mosquito biting a human hand.

Image: USGS Scientist Set Mistnets for West Nile Virus Monitoring
February 8, 2005

USGS scientists capture and release wild birds while monitoring for West Nile.

Image: Curlews Caught by Mist Nets

Curlews are very attentive parents and fly close to intruders and alarm call to distract them from their young broods. USGS scientists take advantage of this behavior by using a mist net to sweep birds out of the air when they approach. In June 2007, USGS scientists used this approach to tag 13 curlews with satellite transmitters at their southern breeding area in Alaska. They use satellite telemetry to track these birds, in order to map their migration routes and find the location of their nonbreeding areas.