Eastern Equine Encephalitis (EEE) has been confirmed in the City of Hamilton, Ontario. On August 9, 2025, a 14 year old Miniature Horse gelding developed acute neurologic signs (recumbency. muscle fasciculations) and was euthanized. The horse was not vaccinated against EEE. This is the third 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