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

Box Elder County, UT

Outbreak Identifier: 7664

Alert ID: 5239

September 14, 2026

Confirmed Case(s) - No Quarantine

Source: Utah Department of Agriculture and Food

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

Horse 1:
Age: 3; Gender: Mare; Breed: Draft-cross; Usage: Ranch Horse; Onset of Clinical Signs: 8/28/2026; Clinical Signs: 8/28/26: seemed off when loading onto the trailer 9/4/26: continued to seem off, incresingly responsive, mild ataxia and a fall; no fever or additional signs; Confirmation Date: 9/11/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;

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