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

Musselshell County, MT

Outbreak Identifier: 7049

Alert ID: 4570

September 10, 2025

Confirmed Case(s) - Official Quarantine

Source: State Veterinarian

Number Confirmed: 1;

Horse 1:
Age: 18; Gender: Gelding; Breed: Grade; Confirmation Date: 8/28/2025; Horse Status: Quarantined;

Comments: The horse was kept at a personal residence and was home to one other equine. By working through the history of this animal and tracing previous locations where the animal was housed, we have identified roughly 50 potentially exposed animals that will be tested for EIA.;

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