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It's Still Mosquito Season - Take Steps to Prevent West Nile Virus

An American kestrel bird from the Ypsilanti area was submitted to the state in September and tested positive for West Nile, making it the 5th positive bird in our community this year. Eliminate standing water, prevent mosquito bites and report dead birds.

Washtenaw County Public Health encourages residents to take measures to reduce the spread of West Nile virus. Mosquitoes are still active until after the first hard frost of the season.

Five birds have tested positive for West Nile in Washtenaw County so far in 2017:

  • American kestrel, found in September in Ypsilanti
  • House sparrow, found September 9 in the Saline area
  • Red-tailed hawk, found sick August 25 in the City of Saline
  • Crow, found dead August 3 in the 48104 zip code area of Ann Arbor
  • Green heron, found June 21 in the Ypsilanti area


39 human cases have been identified in Michigan in 2017; none to date in Washtenaw County.

West Nile is a mosquito-borne virus that can cause mild illness (West Nile fever) or severe symptoms (encephalitis or meningitis, an inflammation of the brain) in humans and other animals. West Nile is primarily transmitted through the bite of an infected mosquito. Mosquitoes become infected with West Nile when they feed on infected birds that carry the virus in their blood. In 2016, there were 43 human cases and three deaths in Michigan. Washtenaw County had two human cases and no deaths.

“We’ve seen West Nile in Michigan for the past 16 years,” says Laura Bauman, epidemiology manager with Washtenaw County Public Health. “When summer comes around, it is always important to take steps to prevent mosquito bites and the spread of the virus.”

Follow these tips to keep yourself and your family safe:

    • Mosquitoes need water in which to lay their eggs, so eliminate standing water around your home and yard. Get rid of old tires, tin cans, buckets, drums, bottles or any water-holding containers. Fill in or drain any low places (puddles, ruts, etc.) in the yard. Keep drains, ditches and culverts free of weeds and trash so water will drain properly. Empty plastic wading pools at least once a week and store indoors when not in use. Unused swimming pools should be drained and kept dry during the mosquito season. Change the water in pet dishes, horse troughs, birdbaths and plant pots or drip trays at least once each week.
    • Use personal protection measures to prevent mosquito bites. Wear long sleeves, long pants, shoes and socks. Wear insect repellent containing active ingredients approved by the EPA -- visit the EPA's Inspect Repellent Search Tool for help in finding the right insect repellent for your needs. Spray clothing with repellent, as mosquitoes may bite through thin clothing. Read repellant labels carefully and follow instructions.
    • High numbers of dead birds can indicate that the virus is active in a particular area, so report any dead birds you find. Report dead birds at the State of Michigan Sick or Dead Bird & Mammal Reporting Website.

Be sure to continue these precautions throughout the summer and fall. August and September are the months of greatest risk to humans for becoming infected with West Nile in Michigan. For more information, as well as a chart of current virus activity, visit

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