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.

Disease

Outbreak States

Start Date

End Date

Equine Herpesvirus- Neurologic

Regional Municipality of Niagara, ON

Outbreak Identifier: 6762

Alert ID: 4253

March 10, 2025

Confirmed Case(s) - Voluntary Quarantine

Source: OMAFA

Number Confirmed: 2;
Number Exposed: Unknown;
Number Euthanized: 2;
Facility Type: Private Facility;

Horse 1:
Age: 7; Gender: Mare; Breed: Thoroughbred (TB); Clinical Signs: This mare developed ataxia that progressed and she was subsequently euthanized. The following day, in a separate barn, another mare became acutely neurologic and recumbent. She was also euthanized. No other horses have displayed neurologic signs however there have been a few horses with a fever. PCR testing on both neurologic mares confirmed EHV-1 infection.;

Comments: The facility owner has instituted voluntary animal movement restrictions and biosecurity procedures. 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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