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West Nile Virus

West Nile virus (WNV), which has been widespread in Africa, southern Europe, the Middle East and western Asia, first appeared in the New York City area of the United States in 1999. The disease spread west quickly and was found in Wisconsin for the first time in 2001 in infected wild birds. The first human cases of disease from WNV in Wisconsin appeared in 2002.

WNV is an arbovirus (arthropod-borne virus) transmitted to birds and mammals by the bite of an infected mosquito. 

Very few mosquitoes actually carry the virus. In nature, the virus cycles between birds and mosquitoes but can infect humans and domestic animals, such as horses.

WI "Fight the Bite" slogan image

2008 Summary Data of WNV
positive cases in Wisconsin

Updated September 2, 2008

Avian (bird)

23

Equine (horse)

2

Human Confirmed

3
Human Probable  0
Counties Reporting WNV Activity 17

For more information go to the
 
Surveillance Map

 

Dead Bird Reporting Hotline 
800-433-1610

For information regarding West Nile virus in Wisconsin contact
Diep Hoang Johnson
608-267-9000

WNV Home  |  Overview  |  Reducing Your Risk  |  Surveillance Map
County Surveillance Count
  |  County Bird Surveillance Count
  Surveillance Plans  |  Resources  |  News Releases 

Last Revised: September 02, 2008