Epizootic hemorrhagic disease

Attention! This is a potentially life-threatening condition for your Cow. Time is of the essence, contact your veterinarian immediately.

Epizootic Hemorrhagic Disease

Epizootic hemorrhagic disease (EHD) is a vector-borne viral disease that affects cattle and white-tailed deer. Deaths are uncommon however it can cause severe dehydration in affected animals, leading to high mortalities during high temperatures. Most infections with the North American strains of EHD appear to be subclinical and seropositive cattle may be common in some regions. Evidence also suggests that pregnant cows may experience reproductive problems (such as abortions and fetal resorptions).

It is transmitted mainly through bites from infected biting midges, gnats, and mosquitoes.


Swollen eyes
Labored breathing
Severe oral erosions
Sloughing of the oral and nasal mucosa


  • History
  • Clinical signs
  • Physical exam
  • Laboratory tests


Supportive care

Article Reference

Risk Factors

  • Large populations of white-tailed deer living in the same vicinity as cattle

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