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

Weld County, CO

Outbreak Identifier: 6963

Alert ID: 4479

August 14, 2025

Confirmed Case(s) - No Quarantine

Source: State Veterinarian

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

Horse 1:
Age: 10; Gender: Gelding; Breed: Friesian; Usage: Horse Show; Onset of Clinical Signs: 8/4/2025; Clinical Signs: Owner noticed some hind end ataxia and mm fasciculations and has seen WNV before so brought horse for testing; Confirmation Date: 8/7/2025; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

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