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: 7024

Alert ID: 4544

August 30, 2025

Confirmed Case(s) - No Quarantine

Source: Utah Department of Agriculture and Food

Number Confirmed: 1;
Number Exposed: 7;
Number Euthanized: 1;
Facility Type: Private Facility;

Horse 1:
Age: 2; Gender: Mare; Breed: Arabian; Usage: Breeding; Onset of Clinical Signs: 8/19/2025; Clinical Signs: Owner noted she was down in the stall at the PM feeding. Vet visited and treated, for presumtive casting, no fever. After 2 more days of the filly going down, the vet returned and drew blood. Owner elected for humane euthanasia the following day. Filly had progressed to facial paralysis among other signs.; Horse Status: Euthanized; Vaccination Status: Unvaccinated;

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