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: 6932

Alert ID: 4446

July 29, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 2; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 7/27/2025; Clinical Signs: This 2 year old gelding was euthanized after developing a fever (40 C) with acute neurological signs progressing to recumbency. PCR testing was positive for EEE .; Confirmation Date: 7/28/2025; Horse Status: Euthanized; Vaccination Status: Undervaccinated;

Comments: This is the first horse confirmed with EEE 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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