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

Wellington County, ON

Outbreak Identifier: 7501

Type: EHV-1

Alert ID: 5070

July 09, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: Ontario Ministry of Agriculture, Food, and Agribusiness

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

Horse 1:
Age: 24; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 7/7/2026; Clinical Signs: This mare developed acute ataxia in all four limbs with muscle fasciculations and hyperesthesia on July 7. Clinical signs progressed and she was euthanized. Nasal swab and blood samples were positive for EHV-1 by PCR. There was no history of recent travel.; 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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