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: 7014

Alert ID: 4531

August 28, 2025

Confirmed Case(s) - No Quarantine

Source: Utah Department of Agriculture and Food

Number Confirmed: 1;
Number Exposed: 5;
Facility Type: Private Facility;

Horse 1:
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Roping; Onset of Clinical Signs: 8/20/2025; Clinical Signs: Weakness, muscle fasciculations and neurologic behavior for 3 days prior to veterinary visit. Treated on site with LRS, DMSO and WNV plasma. After 5 days of treatment, only weakness remains.; Horse Status: Recovering; Vaccination Status: Status Unknown;

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