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

Cache County, UT

Outbreak Identifier: 7649

Alert ID: 5224

September 11, 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: 2; Gender: Gelding; Breed: Mustang; Usage: Pleasure Riding; Onset of Clinical Signs: 8/31/2026; Clinical Signs: Horse apprearaed off and increasingly reactive after a short trailer ride with mild muscle fasiculations. Progressively worse muscle tremors over the follwoing 3 days. 9/3/26 began dexamethason treatment and improvement was seen.; Confirmation Date: 9/4/2026; Horse Status: Recovering; Vaccination Status: Vaccinated;

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