Outbreaks | Equine Disease Communication Center

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.

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Eastern Equine Encephalitis

Wellington County, ON

Outbreak Identifier: 6962

Alert ID: 4478

August 14, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

Number Confirmed: 1;
Facility Type: Farm;

Horse 1:
Age: 8; Gender: Mare; Breed: Shetland Pony; Clinical Signs: On August 2, the mare developed a fever and was lethargic. By August 3, the mare had developed acute neurologic signs (head-pressing, ataxia) and was referred to an equine hospital where she was reported to have a signs of cranial nerve involvement (horizontal nystagmus, head tilt, neck to the right and absent menace response). She was euthanized.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the second confirmed EEE case in Ontario this year and the second for Wellington County. 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;;;

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