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

Outbreak Identifier: 6570

Alert ID: 4041

October 09, 2024

Outbreak Update

Source: USDA-APHIS-Veterinary Services

Facility Type: Racetracks
Comments: Multi-State Equine Infectious Anemia Outbreak in Quarter Horse Racehorses

On September 20th and 24th, the National Veterinary Services Laboratories (NVSL) confirmed equine infectious anemia (EIA)-positive results in 4 Quarter Horse racehorses that were part of a group recently moved from racing in New Mexico to Los Alamitos in California. Several of the EIA-positive horses were showing clinical signs of EIA upon arrival to California. Testing of in-contact horses in California and epidemiologically-linked horses in Texas and New Mexico yielded an additional 12 EIA-positive horses. All 16 EIA-positive horses (7 in CA, 1 in NM, 8 in TX) were racing under the same trainer and attending the same series of sanctioned races in New Mexico in August and September. Additional exposed horses have been identified and are in the process of being tested in multiple states. The current epidemiological investigation indicates that spread of EIA among these horses occurred by iatrogenic transmission. Updates to the current situation will be posted as more information becomes available. Prior alerts 4020, 4042

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