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.

Disease

Outbreak States

Start Date

End Date

Search by Alert ID

Search by Outbreak ID

West Nile Virus

Regional Municipality of Waterloo, ON

Outbreak Identifier: 6968

Alert ID: 4484

August 15, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

Number Confirmed: 1;
Facility Type: Farm;

Horse 1:
Age: Yearling; Gender: Filly; Breed: Standardbred; Onset of Clinical Signs: 8/9/2025; Clinical Signs: This filly developed acute neurologic signs with 48 hours (ataxia, blindness, recumbency) and was euthanized. She tested positive for WNV by PCR.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

Comments: This is the first 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;

Search for County

Disease Alerts