Wisconsin reports over 1,100 deer deaths in 2026 epizootic hemorrhagic disease outbreak
The state DNR says at least 1,100 white-tailed deer have died from epizootic hemorrhagic disease across five counties, the largest toll recorded in Wisconsin.
The Wisconsin Department of Natural Resources confirmed that an outbreak of epizootic hemorrhagic disease (EHD) has killed an estimated 1,100 white-tailed deer in Washington, Dodge, Milwaukee, Ozaukee and Waukesha counties. Reports filed through Sept. 14 list roughly 900 deaths in Washington County, 200 in Waukesha, 30 in Ozaukee, 20 in Dodge and about 10 in Milwaukee, though officials note the actual number is likely higher.
EHD is a viral illness transmitted by biting midges that causes rapid internal bleeding, high fever and organ damage. In regions where the virus is common, mortality usually stays below 25 % of affected deer, but Wisconsin’s limited prior exposure can lead to much higher death rates, according to the DNR.
"The impacts of EHD on northern states seems to be changing," said Scott Larsen, a veterinarian with the Michigan DNR Wildlife Division, noting warmer, wetter weather and the emergence of new virus strains that may complicate herd immunity.
The disease typically appears in late summer and fall, when midge activity peaks, and infected deer often die within three to 36 hours of showing symptoms. The DNR urges the public to report dead or sick deer via its wildlife health website to aid monitoring and management.
Despite the high mortality, the agency does not anticipate changes to hunting regulations or antler-less tag availability at this time. Outbreaks usually subside after the first hard frost as insect populations decline, and the virus does not pose a risk to humans.