Wisconsin DNR reports epizootic hemorrhagic disease in deer across six counties

The Wisconsin Department of Natural Resources said the state's biggest recorded outbreak of epizootic hemorrhagic disease (EHD) has likely spread to six southeastern counties. Laboratory testing of dead white-tailed deer in Washington County in August and in Waukesha County in September confirmed the presence of the virus, DNR herd-health specialist Erin Larson said.

According to the agency, reported deer mortalities total about 1,200 in Washington County, roughly 390 in Waukesha County, around 80 each in Dodge and Ozaukee Counties, about 10 in Milwaukee County and fewer than 10 in Jefferson County. The figures represent only reported cases; officials estimate many additional deaths may have occurred.

The DNR continues to collect reports of sick or dead deer and is prioritising sampling in areas where the virus has not yet been confirmed. Larson noted that previous Wisconsin outbreaks saw deer populations recover quickly and that the agency does not plan to limit antler-less deer tags or otherwise restrict hunting in the affected counties.

EHD is transmitted by biting midges and typically peaks in late summer and fall when insect activity is highest. The disease can cause rapid death, often within hours of symptom onset, and does not pose a risk to humans. The department is testing a recent Waukesha sample to determine the virus serotype, with results expected in the coming weeks, and urges the public to report observations through its wildlife-health website.