PORTAGE COUNTY — A Portage County horse has been confirmed as the first case of eastern equine encephalitis in Wisconsin for 2026.
Eastern equine encephalitis (commonly known as EEE), is a viral disease that is spread through the bite of an infected mosquito. It can be spread through the infected bug to both animals and people, but is not contagious and does not transfer between people, animals, or animals to people.
Symptoms include a sudden fever, headaches, and vomiting. The viral disease can cause inflammation of the brain, seizures, and coma.
The Wisconsin Department of Agriculture, Trade, and Consumer Protection confirmed the infected horse began showing symptoms on Aug. 18, with the disease confirmed on Aug. 27. The horse was a four-year-old standardbred mare. The mare was unvaccinated and showed symptoms that included fever, seizure like activity, poor muscle control, and an increase of lying down. The horse was ultimately euthanized.
Horses are the only animal able to receive vaccines for the viral disease. No vaccine currently exists for humans or other pets. The best way to prevent contracting EEE is through mosquito prevention, such as bug spray and limiting time outdoors.
There is no cure or specific medicine available to treat EEE, rather treatment focuses on supportive care that manages specific symptoms.
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