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

Regional Municipality of Halton, ON

Outbreak Identifier: 7033

Alert ID: 4554

September 03, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 3;
Facility Type: Farm;

Horse 1:
Age: 16; Gender: Mare; Breed: Draft; Onset of Clinical Signs: 8/21/2025; Clinical Signs: The mare was clinically normal that morning but by late afternoon had developed acute, progressive neurologic signs and she was euthanized the following day despite supportive therapy.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the sixth 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;

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