Non-lactating dairy cattle in Waukesha County tested positive for epizootic hemorrhagic disease

The Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) has officially confirmed that samples taken from non-lactating dairy cattle in Waukesha County tested positive for epizootic (ep-ih-zoh-AH-tic) hemorrhagic disease (EHD). The virus has also been identified in local wild and captive deer populations. EHD is a reportable condition that livestock owners and veterinarians must disclose to DATCP within 10 days of discovery.

Transmitted primarily by biting midges and flies, EHD typically surfaces during late summer and early autumn when insect populations peak. Cases generally decline following the season's first hard frost. While Wisconsin last identified an EHD case in cattle in 2013, clinical symptoms in cattle remain uncommon. When signs do appear, they may include fever, excess salivation, weight loss, lameness, and lesions on the mouth, teats, or hooves. Because these symptoms can mimic foreign animal diseases, thorough testing is essential.

Although no specific treatment exists for EHD, livestock owners are advised to partner with their veterinarians to manage herd health, focus on insect control, ensure optimal nutrition, and prevent overcrowding. DATCP emphasizes that EHD poses no health threat to humans, and consuming meat or dairy products from infected animals is entirely safe.