Disease Alerts

Number Confirmed: 1; 
Number Exposed: 3; 

Horse 1: 
Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Comments: A 4–year–old Appendix Quarter Horse gelding in Fresno County was confirmed positive for Equine Infectious Anemia (EIA). The horse was euthanized on March 27, 2026, due to worsening clinical signs. Three (3) potentially exposed horses on the home premises have initially tested negative for EIA and will remain under quarantine until their 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 horse had recently trained on the same premises as the current Stanislaus County EIA incident. Related to previous alert ID: 4938.;

Number Confirmed: 1; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 4/9/2026; 

Comments: A 3–year–old Quarter Horse gelding in San Joaquin County was confirmed positive for Equine Infectious Anemia (EIA). Epidemiological tracing determined that this horse had recently trained on the same premises as the current Stanislaus County EIA incident. The gelding has been quarantined on premises with no additional exposed horses on the property. Related to previous alert ID: 4938.;

Number Confirmed: 15; 
Number Exposed: 12; 
Number Euthanized: 15; 
Comments: Thirteen (13) additional horses on the home premises tested positive for EIA. Euthanasia was elected by owners for these cases and was witnessed by CDFA veterinarians on March 24, 2026 and April 7, 2026. The remaining twelve (12) exposed horses will remain under quarantine until their sixty (60) day retest.;

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.;

Number Confirmed: 1; 
Number Exposed: 1; 
Comments: The one (1) potentially exposed horses on this premises tested negative on the sixty (60) day retest. Quarantine on this premises has been released.; 
Previous Alerts: 4842

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Comments: Quarantined 2/20/26. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures.;

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Comments: Quarantined 2/26/26. Quarantines will not be released until TAHC’s requirements are met. TAHC staff work closely with the owners and local veterinarians to monitor potentially exposed horses and implement biosecurity measures.;

Number Confirmed: 8; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Comments: On March 5, 2026, positive equine infectious anemia (EIA) results were confirmed by the Canadian Food Inspection Agency’s (CFIA) national reference laboratory for eight horses located on a premises in Bonnyville No. 87, Alberta. The horses had been tested by the CFIA as part of an on-going disease investigation. No clinical signs of disease 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 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: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Comments: On February 26, 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 the Municipal District of Bonnyville, Alberta. The horse had been tested by an accredited veterinarian at the owner’s request. No clinical signs of the disease 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: 1; 
Number Exposed: 35; 

Horse 1: 
Age: 4; Gender: Mare; Breed: Quarter Horse (QH); Confirmation Date: 2/2/2026; Horse Status: Euthanized; 

Comments: A 4–year–old Quarter Horse mare in Riverside County was confirmed positive for Equine Infectious Anemia (EIA). Thirty-five (35) potentially exposed horse on the home premises has initially tested negative for EIA and will remain under quarantine until their sixty (60) day retest as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation, and epidemiological tracing is ongoing.;