Disease alerts - Eastern Equine Encephalitis in Ontario, July 28, 2025 - Eastern Equine Encephalitis in Ontario, July 28, 2025 - Eastern Equine Encephalitis in Ontario, July 28, 2025

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Regulatory Category- Federal:

Immediately Notifiable

Regulatory Category- Province or Territory:

Immediately Notifiable

Animal Type:

Equine

Susceptible Animal Types:

Equine

Animal Class:

Terrestrial

Disease Agent:

Eastern equine encephalomyelitis

Disease Agent Type:

Virus

Organization:

Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA)

Region:

Ontario

Event Size:

1 individual

Problem(s):

Nervous systems signs

Topics:

Endemic;
Vector/Vector-borne

Start Date

Jul/28/2025

End Date

Jul/28/2025

Website

Equine Disease Communication Center

Eastern Equine Encephalitis in Ontario, July 28, 2025

Ontario Ministry of Agriculture, Food and Agribusiness (OMAFA)

Eastern Equine Encephalitis (EEE) has been confirmed in Wellington County, Ontario. On July 27, 2025, a 2 year old Warmblood gelding was euthanized after developing a fever (40 C) with acute neurological signs progressing to recumbency. PCR testing was positive for EEE on July 28, 2025. The horse was undervaccinated against EEE. This is the first horse confirmed with EEE in Ontario this year. To see past and present EEE cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.