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

Stanislaus County, CA

Outbreak Identifier: 7371

Alert ID: 4922

March 20, 2026

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 2;
Number Exposed: 25;

Horse 1:
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 3/19/2026;

Horse 2:
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 3/19/2026;

Comments: A 7–year–old Quarter Horse gelding and an 8–year–old Quarter Horse gelding in Stanislaus County were confirmed positive for Equine Infectious Anemia (EIA). Twenty-five (25) potentially exposed horses on the home premises have been tested for EIA with results pending. The twenty-five (25) potentially exposed horses will remain under quarantine until pending lab results are received and their sixty (60) day retest samples are completed as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation. Epidemiological tracing is ongoing, but transmission is suspected to be iatrogenic.;

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