Wisconsin Confirms EHD in Cattle Amid Deer Outbreak

Wisconsin has confirmed epizootic hemorrhagic disease (EHD) in cattle for the first time since 2013 as the state experiences a significant outbreak among white-tailed deer. Non-lactating dairy cattle in Waukesha County tested positive after young pasture-raised heifers developed mild hoof lesions.

EHD is transmitted by biting midges and typically occurs during late summer and early fall. Although the disease can severely affect deer, cattle rarely develop clinical illness. When symptoms occur, they can include lameness, fever, weight loss, excessive salivation, and lesions on the limbs, mouth, or teats.

Officials emphasize Veterinary involvement because some EHD symptoms resemble those associated with foreign animal diseases, requiring laboratory testing for accurate diagnosis. More than 1,600 suspected deer cases have been reported in Washington and Waukesha counties. There is no treatment for EHD, so Wisconsin officials recommend insect and parasite control, proper nutrition, avoiding overcrowding, and maintaining overall herd health.