West Nile Encephalitis Maps and Statistics - Minnesota Dept. of Health

West Nile Virus Maps and Statistics

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  • West Nile virus (WNV) was first found in Minnesota in 2002 and has since become the most commonly reported mosquito-transmitted disease in the state.
  • The highest risk areas for WNV in Minnesota include the western and central portions of the state. Open areas, such as farm land and prairie, provide the best habitat for Culex tarsalis, the primary mosquito vector of the virus.
  • Similar to other arboviruses, most WNV cases occur later in the summer (July through September) when infected vector populations are at their highest level.
  • In 2015, 9 cases of WNV disease were reported in Minnesota. There were no deaths, but 3 (33%) had neuroinvasive illness including encephalitis or meningitis. The other 6 (67%) cases had West Nile (WN) fever. Six WNV-positive blood donors, who had no symptoms, were also identified in 2015.

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Updated Tuesday, August 30, 2016 at 09:57AM