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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West Nile Virus

Utah County, UT

Outbreak Identifier: 6989

Alert ID: 4505

August 22, 2025

Confirmed Case(s) - No Quarantine

Source: Assistant State Veterinarian

Number Confirmed: 1;
Number Suspected: 40;
Number Exposed: Unknown;
Facility Type: Private Facility;

Horse 1:
Age: 15; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Ranch Horse; Onset of Clinical Signs: 8/10/2025; Clinical Signs: Initial ataxia and weakness in the hind end, down the next day and death on day 3.; Horse Status: Deceased; Vaccination Status: Unvaccinated;

Comments: Rodeo horses on premise vaccinated, but not ranch horses due to cost.;

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