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

Dufferin County, ON

Outbreak Identifier: 7382

Type: EHV-1

Alert ID: 4934

April 02, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: OMAFA

Number Confirmed: 1;
Number Exposed: 3;
Facility Type: Boarding Facility;

Horse 1:
Age: 14; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 3/31/2026; Clinical Signs: This mare was found down in the field on Mar 31. She was assisted into the barn and then into isolation where she became recumbent with urinary incontinence. Her condition worsened and she was euthanized April 1. Blood and nasal swab samples were positive for EHV-1 by PCR.; Horse Status: Euthanized;

Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. 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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