The Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) and the Wisconsin Veterinary Diagnostic Laboratory confirmed that a Dunn County horse tested positive for Eastern equine encephalitis (EEE). It is the state’s first confirmed equine case of EEE this year.
The unvaccinated crossbred mare was approximately 10 years old and was euthanized due to her rapidly progressing neurologic symptoms. Subsequent testing was positive for EEE.
DATCP encourages horse owners to vaccinate their horses against EEE and West Nile virus (WNV), which are both transmitted by mosquitoes. EEE is fatal in more than 90% of equine cases, and WNV is fatal in 30-40% of cases.