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: 7615

Alert ID: 5190

September 01, 2026

Confirmed Case(s) - No Quarantine

Source: State Veterinarian's Office

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

Horse 1:
Age: 1; Gender: Mare; Breed: Paint; Onset of Clinical Signs: 8/31/2026; Clinical Signs: Ataxia, Abnormal Mentation, Cranial Nerve Deficits, Fasciculation, Partial seizures; Confirmation Date: 9/1/2026; Horse Status: Euthanized; Vaccination Status: Vaccinated;

Comments: Horse rapidly declined, owner chose euthanasia.;

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