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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Eastern Equine Encephalitis

Oswego County, NY

Outbreak Identifier: 6984

Alert ID: 4500

August 22, 2025

Confirmed Case(s) - No Quarantine

Source: State Animal Health Official

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

Horse 1:
Age: Yearling; Gender: Colt; Clinical Signs: Colt was found acutely down in stall and trembling. When assisted to stand, it was ataxic and weak. Vet came to examine and noted a temp of 101.5, BAR colt. The following day, the colt was progressively worse. It was down again in stall, unable to rise and inappetant. Muscle fasiculations were noted, cool/flaccid distal limbs and a temp of 98.9. The colt had a nystagmus, no tongue tone and decreased tail tone and urine dribbling. It was not able to stand.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

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