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

Search by Alert ID

Search by Outbreak ID

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.

West Nile Virus

Grey County, ON

Outbreak Identifier: 7132

Alert ID: 4654

October 10, 2025

Confirmed Case(s) - No Quarantine

Source: OMAFA

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

Horse 1:
Age: 3; Gender: Filly; Breed: Quarter Horse (QH); Onset of Clinical Signs: 9/20/2025; Clinical Signs: This filly was referred to an equine hospital around September 20 due to acute onset of neurologic signs (ataxia).; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Comments: This is the 8th confirmed case of equine WNV in Ontario this year . To see past and present WNV cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;;

Search for County

Disease Alerts