Disease Alerts

Number Confirmed: 2; 
Number Exposed: 1; 

Horse 1: 
Age: 4; Gender: Stallion; Breed: Quarter Horse (QH); 

Horse 2: 
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); 

Comments: A 4–year–old Quarter Horse stallion and a 5-year-old Quarter Horse mare in Riverside County were confirmed positive for Equine Infectious Anemia (EIA). One (1) potentially exposed horse on the home premises has initially tested negative for EIA and will remain under quarantine until the sixty (60) day retest as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation. Epidemiological tracing determined that the positive horses were linked to the recent San Bernardino County EIA incidents.;

Number Confirmed: 6; 
Number Exposed: 7; 
Comments: Six (6) Quarter Horses in San Bernardino County were confirmed positive for Equine Infectious Anemia (EIA). Seven (7) potentially exposed horses on the home premises have initially tested negative for EIA and will remain under quarantine until the sixty (60) day retest as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation. Epidemiological tracing determined that the positive horses were linked to the other most recent San Bernardino County EIA incident and the current Riverside County EIA incident.;

Number Confirmed: 1; 
Number Euthanized: 1; 
Comments: A confirmed EIA positive equid must be euthanized or quarantined for life 200 yards away from any EIA negative equid as per USDA EIA program rules. Euthanasia was elected for this case and was witnessed by CDFA veterinarians on May 1, 2026. As there were no additional horses on the premises, quarantine was released.; 
Previous Alerts: 4973

Number Confirmed: 1; 
Number Euthanized: 1; 
Comments: A confirmed EIA positive equid must be euthanized or quarantined for life 200 yards away from any EIA negative equid as per USDA EIA program rules. Euthanasia was elected for this case and was witnessed by CDFA veterinarians on April 30, 2026. As there were no additional horses on the premises, quarantine was released.; 
Previous Alerts: 4945

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Comments: On April 30, 2026, positive equine infectious anemia (EIA) results were confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for a horse located on a premises in Minitonas, Manitoba. The horse had been tested by the CFIA at the owner’s request to fulfill an export requirement. No clinical signs were noted at the time of sampling. A CFIA investigation is underway and as per program policy, movement controls have been placed on the infected horse and any on-premises contact animals. Initial reports indicate there are several other equines on the affected premises. Movement controls will remain until all disease response activities have been completed, including follow-up testing and ordering the destruction of confirmed cases. Trace-out activities may require the CFIA to undertake actions at additional premises as outlined in the current policy. Improved biosecurity protocols have been strongly recommended to the owners to help control the ongoing spread of EIA and protect our national herd.;

Number Confirmed: 3; 
Number Exposed: 15; 
Number Euthanized: 3; 
Facility Type: Training Facility; 

Horse 1: 
Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Clinical Signs: Tested due to 60-day retest at previously positive premises; Confirmation Date: 4/13/2026; Horse Status: Euthanized; 

Horse 2: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Clinical Signs: Tested for 60-day retest at previously positive premises.; Confirmation Date: 4/13/2026; Horse Status: Euthanized; 

Horse 3: 
Age: 6; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Confirmation Date: 4/13/2026; Horse Status: Euthanized; 

Previous Alerts: 4861

Number Confirmed: 1; 
Number Euthanized: 1; 
Comments: A confirmed EIA positive equid must be euthanized or quarantined for life 200 yards away from any EIA negative equid as per USDA EIA program rules. Euthanasia was elected for this case and was witnessed by CDFA veterinarians on April 22, 2026. As there were no additional horses on the premises, quarantine was released.; 
Previous Alerts: 4972, 4961

Number Confirmed: 1; 

Horse 1: 
Age: 4; Gender: Mare; Breed: Quarter Horse (QH); Confirmation Date: 4/27/2026; 

Comments: A 4–year–old Quarter Horse mare in San Bernardino County was confirmed positive for Equine Infectious Anemia (EIA). The mare has been quarantined on premises with no additional exposed horses on the property. Epidemiological tracing is ongoing, but transmission is suspected to be iatrogenic.;

Number Euthanized: 1; 

Horse 1: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 4/20/2026; Horse Status: Euthanized; 

Comments: A 5–year–old Quarter Horse gelding in Santa Clara County was confirmed positive for Equine Infectious Anemia (EIA). The gelding has been quarantined on premises with no additional exposed horses on the property. Epidemiological tracing is ongoing, but transmission is suspected to be iatrogenic.; The horse was euthanized April 22, 2026; 
Previous Alerts: 4961

Number Confirmed: 1; 

Horse 1: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 4/20/2026; Horse Status: Affected And Alive; 

Comments: A 5–year–old Quarter Horse gelding in Santa Clara County was confirmed positive for Equine Infectious Anemia (EIA). The gelding has been quarantined on premises with no additional exposed horses on the property. Epidemiological tracing is ongoing, but transmission is suspected to be iatrogenic.;