Disease Alerts

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: A quarantine was placed on 06/29/2026. WSDA is working closely with the owner and private veterinarian to monitor and test any potentially exposed horses. The quarantine will remain in effect until WSDA's requirements are met.;

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Comments: Quarantined 5/1/26. 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 4/28/26. 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: 6; 
Number Exposed: 50; 
Number Euthanized: 6; 

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

Horse 2: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Horse 3: 
Age: 6; Gender: Mare; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Horse 4: 
Age: 7; Gender: Gelding; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Horse 5: 
Age: 4; Gender: Mare; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Horse 6: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Comments: Six (6) Quarter Horses in Santa Clara County were confirmed positive for Equine Infectious Anemia (EIA). 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 these cases and was witnessed by CDFA veterinarians on June 26, 2026. Fifty (50) 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 is ongoing, but these cases are linked to recent EIA cases in California.;

Number Confirmed: 1;

Comments: A quarantine has been issued for the facility and exposed horses.

Number Confirmed: 5; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: 13 horses on facility. Working on epidemiology and bush track exposure. Talking to owner on plan for animals.

Number Confirmed: 16; 
Number Exposed: 11; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 6/18/2026; 

Comments: One (1) additional horse on the home premises, a 3-year-old Quarter Horse gelding, tested positive for EIA on the 60-day retest. The total number of cases at this premises is now sixteen (16). The remaining eleven (11) exposed horses will remain under quarantine for another sixty (60) days until their next retest.; 
Previous Alerts: 4938

Number Confirmed: 1; 
Number Exposed: 27; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 10; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Racing; Clinical Signs: Tested due to exposure to previous positive horse; Confirmation Date: 5/26/2026; 

Comments: Horse had been exposed to previous EIA positive horse a year and a half ago; flagged suspect EIA positive on ELISA at CDA AHL on 5/20/2026; 
Previous Alerts: 4977, 4861

Number Confirmed: 1; 
Number Exposed: 3; 
Number Euthanized: 1; 
Comments: The three (3) potentially exposed horses on this premises tested negative on the sixty (60) day retest. Quarantine on this premises has been released.; 
Previous Alerts: 4946

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.;