Epizootic Hemorrhagic Disease (EHD) is a viral disease that affects deer, cattle and, most recently yak. Signs of EHD include fever, loss of appetite, weakness, respiratory distress, and swelling of the tongue, and erosive lesions in the mouth. The disease cannot be transmitted by direct contact and is spread by insects, most commonly midges or gnats.
Resources
The Center for Food Security & Public Health (CFSPH): Epizootic Hemorrhagic Disease
The Cattle Site: Epizootic Hemorrhagic Disease
OIE Epizootic Hemorrhagic Disease (EHD) Fact Sheet