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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Equine Herpesvirus- Neurologic

Regional Municipality of Halton, ON

Outbreak Identifier: 7040

Alert ID: 4561

September 05, 2025

Confirmed Case(s) - Voluntary Quarantine

Source: OMAFA

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

Horse 1:
Age: 23; Gender: Mare; Clinical Signs: This mare developed acute neurologic signs (recumbency) on Sept 2. She is still receiving supportive treatment.; Horse Status: Affected And Alive;

Comments: The farm owner has implemented voluntary animal movement restrictions and biosecurity measures. To see past and present EHV-1 neurologic (EHM) cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

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