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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Equine Infectious Anemia

Adams County, CO

Outbreak Identifier: 7278

Alert ID: 4837

January 12, 2026

Confirmed Case(s) - Official Quarantine

Source: State Veterinarian's Office

Number Confirmed: 3;
Number Exposed: 11;
Number Euthanized: 3;

Horse 1:
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Usage: Racing; Onset of Clinical Signs: 12/16/2025; Clinical Signs: tested dur to exposure of another positive horse on the premises.; Confirmation Date: 12/23/2025; Horse Status: Euthanized;

Horse 2:
Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Horse Status: Euthanized;

Horse 3:
Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Onset of Clinical Signs: 12/16/2025; Clinical Signs: tested due to exposure to positive EIA horse.; Confirmation Date: 12/23/2025; Horse Status: Affected And Alive;

Previous Alerts: 4816

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