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

San Juan County, UT

Outbreak Identifier: 7114

Alert ID: 4635

October 02, 2025

Confirmed Case(s) - No Quarantine

Source: Utah Department of Agriculture and Food

Number Confirmed: 1;
Number Exposed: 4;
Facility Type: Farm;

Horse 1:
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Usage: Breeding; Onset of Clinical Signs: 9/19/2025; Clinical Signs: Pregnant mare with forelimb ataxia. Treated by veterinarian with anti-inflammatories and antimicrobials. Ataxia resolving by the next day.; Confirmation Date: 9/29/2025; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Comments: housed close to feral horse population;

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