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 York, ON

Outbreak Identifier: 7336

Alert ID: 4883

February 17, 2026

Confirmed Case(s) - Voluntary Quarantine

Source: OMAFA

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

Horse 1:
Age: 15; Gender: Mare; Onset of Clinical Signs: 2/10/2026; Clinical Signs: The mare became acutely recumbent on Feb. 10, 2026. She was assisted to stand and moved to an isolation area, treated supportively, remained stable overnight, became recumbent the following morning but has improved since then. Her ataxia is markedly improved but she still appears to have some urinary incontinence. Nasal swab and blood samples were positive for EHV-1 by PCR.; Horse Status: Recovering; Vaccination Status: Vaccinated;

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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