Breaking News
ALERT: Screwworm Confirmed in the United States
Learn More

Disease Alerts

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.



1 Week
2 Weeks
1 Month
2 Months
3 Months
3+ Months
No Results

The color range is based off of the selected End Date. If the End Date doesn't have a value it will use Today's Date.

Equine Herpesvirus- Neurologic
Simcoe County, ON
Outbreak Identifier: 7465
Type: EHV-1
Alert ID: 5032
June 09, 2026
Confirmed Case(s) - Voluntary Quarantine

OMAFA

Number Confirmed: 1; 
Number Exposed: 15; 
Number Euthanized: 1; 

Horse 1: 
Age: 18; Gender: Gelding; Breed: Thoroughbred (TB); Onset of Clinical Signs: 6/6/2026; Clinical Signs: This gelding developed edema of all four limbs on June 6. His signs progressed to acute hindlimb ataxia and bladder paralysis and he was taken to an equine referral hospital that day. He became recumbent on June 8 and was euthanized. Nasal swab was positive for EHV-1 by PCR.; Confirmation Date: 6/8/2026; Horse Status: Euthanized; 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;
Search for County