Eastern Equine Encephalitis (EEE) has been confirmed in Renfrew County, Ontario. On August 4, 2025, an 8 year old Draft mare developed acute neurologic signs and died that day. The horse was undervaccinated for EEE.
This is the seventh confirmed equine EEE case in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.