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West Nile Virus

West Nile Virus in Dane County

West Nile Virus is found in birds and mosquitoes every year in Dane County. It is occasionally found in people as well.

What is PHMDC doing about WNV?

Our staff collects and monitors information on WNV infection in humans throughout the season. Infections in humans are monitored through lab testing and reports from healthcare providers.

Treatment of Mosquito Breeding Areas

Public Health watches mosquito breeding areas. We treat water on public land that has high numbers of mosquitoes known to carry and transmit WNV (primarily Culex species). The treatment limits the build up of WNV infection in the bird population. This treatment protects human health by reducing the amount of virus in the environment. The Department also traps adult mosquitoes to measure population levels. Some of these mosquitoes are also tested for WNV.

Mosquito Monitoring and Control


For questions about mosquito monitoring and control, contact: jhausbeck@publichealthmdc.com.

Sick or Dead Birds

Public Health collects information on dead crows and blue jays to measure the impact of WNV on the bird population from year to year. It helps us decide how likely it is that humans may get WNV.

Dane County residents who find a sick or dead crow or blue jay should call 1-800-433-1610 to report the bird.

Animal Services Officers will pick up some sick blue jays and crows and have them tested for WNV. Testing for WNV in sick crows and blue jays ends after one bird tests positive.

Beginning May 1, Dane County residents who find a sick or dead crow or blue jay should call 1-800-433-1610 to report the bird.

If you wish to submit a dead bird for testing, please do the following:

  • Double bag the bird and place on ice or freeze as soon as possible.
  • Transport the bird to our office at 2701 International Ln., Rm. 204, Madison, WI 53704.
  • The bird should be intact and not showing signs of decay.
Key Contacts
Report a sick or dead crow or blue jay:
1-800-433-1610

West Nile Virus in Dane County or Mosquito Monitoring & Control:
(608) 266-4821
Email: Public Health