The Sconi

The Wisconsin Department of Health Services (DHS) is advising residents to continue taking precautions against mosquito bites after two horses in the state tested positive for Eastern equine encephalitis virus (EEE). The Department of Agriculture, Trade, and Consumer Protection (DATCP) reported a case in Marathon County yesterday, followed by another confirmation in Clark County. This indicates that mosquitoes capable of spreading EEE are present in Wisconsin.

EEE is a rare but serious disease. One human case was reported earlier this year, though it is believed the infection was contracted during travel to another state. The virus spreads through the bite of an infected mosquito, which acquires EEE by feeding on infected birds. It does not spread directly between humans or animals.

Symptoms of EEE can include fever, headache, chills, and vomiting. In severe cases, it may lead to encephalitis (inflammation of the brain), disorientation, seizures, coma, or death. Approximately 30% of individuals who develop severe EEE will die from it; survivors often face long-term neurological issues. Those most at risk are adults over 50 and children under 15 years old. Currently, there is no specific vaccine or treatment for EEE available for humans.

Given that EEE is circulating in Wisconsin, DHS recommends that residents and visitors take measures to reduce exposure to mosquitoes and eliminate breeding sites. Mosquito activity—and thus the risk of diseases like EEE and West Nile virus—will persist into fall until a hard frost occurs (temperatures below 28 degrees Fahrenheit for at least four consecutive hours).

For more information about EEE and other mosquito-borne illnesses as well as protective measures against these diseases, visit the DHS website.

Ali Maresh serves as Director with Claire Yunker as Deputy Director; Elizabeth Goodsitt and Jennifer Miller are Specialists within DHS.

Members of the media can direct their inquiries to DHSMedia@dhs.wisconsin.gov.

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