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West Nile Virus (WNV)

West Nile Virus (WNV) causes bird disease that is transmitted by mosquitoes. Occasionally humans, horses and other mammals may also be infected. In humans the most serious manifestation of WNV infection is encephalitis (inflammation of the brain) which may result in death. Since West Nile Virus was first detected in North America in 1999 in New York, it has been spreading westward.  

The following dates are linked to informal notes prepared by USGS scientist Tom Roffe, detailing the progression of WNV across the United States, and providing research resources about the disease.

June 20, 2002 July 22, 2002 July 26, 2002
August 2, 2002 August 5, 2002 August 14, 2002
August 14, 2002(2) August 15, 2002 August 16, 2002
Wildlife Health Alert #02-01 August 26, 2002 September 4, 2002
September 12, 2002 September 16, 2002 September 30, 2002
October 4, 2002 November 14, 2002 January 6, 2003
April 25, 2003    

For more information please visit the Biological Resources Discipline National Wildlife Health Center, Madison, WI website on the West Nile Virus.

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Page Last Modified: Friday, March 2, 2007