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 Durham, ON

Outbreak Identifier: 7641

Alert ID: 5216

September 09, 2026

Confirmed Case(s) - No Quarantine

Source: Ontario Ministry of Agriculture, Food, and Agribusiness

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

Horse 1:
Age: 19; Gender: Gelding; Breed: Draft; Onset of Clinical Signs: 8/25/2026; Clinical Signs: This gelding developed acute neurologic signs (ataxia, falling down) on Aug 25, 2026 and was euthanized. Serum was positive for WNV IgM.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the third 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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