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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Strangles

Grey County, ON

Outbreak Identifier: 7264

Alert ID: 4797

December 16, 2025

Confirmed Case(s) - Voluntary Quarantine

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 2;
Facility Type: Farm;

Horse 1:
Gender: Mare; Breed: Standardbred; Onset of Clinical Signs: 12/5/2025; Clinical Signs: This mare developed a fever, became lethargic and anorexic prior to developing enlarged, firm submandibular lymph nodes which abscessed over the weekend (Dec 13/14). She tested positive for S. equi by PCR. She is not involved in the racing industry.; Horse Status: Recovering;

Comments: The farm owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;

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