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

District of Parry Sound, ON

Outbreak Identifier: 7047

Alert ID: 4568

September 09, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

Number Confirmed: 1;
Number Exposed: Unknown;

Horse 1:
Age: 22; Gender: Mare; Breed: Mixed breed; Onset of Clinical Signs: 8/21/2025; Clinical Signs: This mare developed neurologic signs (muscle fasciculations, hyperesthesia, ataxia) on August 21, 2025. She is recovering. She was not vaccinated for WNV but was for the other core diseases (rabies, EEE/WEE and tetanus).; Horse Status: Recovering;

Comments: This is the fifth 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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