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

Merced County, CA

Outbreak Identifier: 7298

Alert ID: 4842

January 20, 2026

Confirmed Case(s) - Official Quarantine

Source: California Department of Food and Agriculture

Number Confirmed: 1;
Number Exposed: 1;

Horse 1:
Age: 4; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: weakness, anemia; Horse Status: Deceased;

Comments: A 4–year–old Quarter Horse mare in Merced County was confirmed positive for Equine Infectious Anemia (EIA). One (1) potentially exposed horse on the home premises has been tested for EIA with results pending. The one potentially exposed horse will remain under quarantine until pending lab results are received and their sixty (60) day retest sample is completed as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation, and epidemiological tracing is ongoing.;

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