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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West Nile Virus

Regional Municipality of Peel, ON

Outbreak Identifier: 7084

Alert ID: 4604

September 22, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

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

Horse 1:
Age: 13; Gender: Mare; Breed: Rocky Mountain Horse; Onset of Clinical Signs: 9/4/2025; Clinical Signs: This mare was initially examined for lameness but then developed ataxia, hyperesthesia, and cranial nerve signs. She was sent to a referral hospital and is recovering.; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Comments: This is the sixth confirmed case of equine WNV in Ontario this year . To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;;

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