Disease Alerts

Comments: Since the start of the outbreak,16 VSV-affected premises have been identified (16 confirmed positive, 0 presumptive positive) in 2 states, Arizona and Colorado. All 16 premises have had only equine species clinically affected in six Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties) and 1 premises in 1 Colorado county (Montezuma County). There were other susceptible species also present on VSV premises in Arizona (cattle on 5 premises, goats on 2 premises) in Cochise, Gila, Maricopa, Santa Cruz, and Yavapai Counties, but they were not clinically affected. For more information go to: https://www.aphis.usda.gov/livestock-poultry-disease/cattle/vesicular-stomatitis;

Number Confirmed: 1; 
Facility Type: Farm; 

Horse 1: 
Confirmation Date: 5/2/2026; 

Comments: The horse is the lone animal on the farm and it is quarantined.;

Number Confirmed: 1; 
Facility Type: Boarding Facility; 
Comments: The boarding facility will be quarantined until no known new cases.;

Number Confirmed: 1; 
Number Exposed: 26; 
Facility Type: Stable; 
Comments: This is the 9th confirmed premises with strangles for Florida in 2026.;

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 Exposed: 38; 
Number Euthanized: 1; 
Facility Type: Boarding Facility; 
Comments: Final group of horses exposed to the index case at HITS Commonwealth National Horse Show have been released from quarantine with no new cases of EHM.; 
Previous Alerts: 4956

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 

Horse 1: 
Age: 20; Gender: Mare; Breed: Cross; Onset of Clinical Signs: 4/27/2026; Clinical Signs: Abortion of full term colt; Confirmation Date: 5/4/2026; Horse Status: Quarantined; Vaccination Status: Unvaccinated;

Comments: Additional abortions reported by client- exact number not reported to protect client confidentiality;

Number Confirmed: 1; 
Number Exposed: 3; 

Horse 1: 
Age: 5; Gender: Stallion; Breed: Quarter Horse (QH); Onset of Clinical Signs: 4/23/2026; Clinical Signs: swollen, draining lymph nodes; Confirmation Date: 5/6/2026; Horse Status: Recovering; Vaccination Status: Status Unknown;

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 

Horse 1: 
Age: 8; Gender: Gelding; Breed: Quarter Horse (QH); Usage: Sales; Onset of Clinical Signs: 4/6/2026; Clinical Signs: Bought at sale about a month ago, has had a cough and snotty nose, started to develop swelling in limbs, sheath and odd spots on body. All four limbs stocked up and swollen up into forearms, petechiae inside muzzle and gums, not able to take temp, safe access in trailer is questionable; Confirmation Date: 5/6/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: Purchased at a sale in Iowa, transported to Nebraska.;