EEE is a mosquito-borne virus with about a 30% fatality rate in people who become ill, and there is no specific treatment beyond supportive care.
Michigan has found no EEE in mosquitoes or animals so far in 2026, but officials are trapping and testing mosquitoes in Roscommon County and monitoring humans, livestock and wildlife.
More than 88,000 mosquitoes in 5,420 pools have been tested statewide; West Nile virus has been detected in Detroit and 10 counties, while Jamestown Canyon virus appeared in 20 pools across six counties.
Health officials urged residents—especially older adults, children and people spending time near woodlands—to use EPA-registered repellents, wear long sleeves and eliminate standing water.