Disease Alerts

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Veterinary Hospital;

Number Confirmed: 1; 
Number Suspected: 4; 
Number Exposed: 1; 
Facility Type: Farm; 

Horse 1: 
Age: 1; Gender: Filly; Breed: Gypsy Vanner; Clinical Signs: This filly developed Strangles ( multiple draining abscesses, persistent fever, weight loss) and died after another horse on the property returned from a 90-day training session at a large training facility which recently had Strangles (see Alert ID 4920). 5 of the 6 horses on this private farm developed Strangles. One senior pony is receiving supportive treatment by the attending veterinarian.; Confirmation Date: 5/8/2026; Horse Status: Deceased; 

Comments: Two outbreaks in 2025 (Alert ID 4302 and 4304) are also epidemiologically linked to the facility in Alert ID 4920. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;

Number Confirmed: 3; 
Number Suspected: Unknown; 
Number Exposed: 70;

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

Horse 1: 
Age: 8; Gender: Mare; Breed: Quarter Horse (QH); Usage: Barrel Racing; Onset of Clinical Signs: 5/5/2026; Clinical Signs: Neurologic-rear limbs, unable to stand. Bilateral nasal discharge. Bladder atony.; Confirmation Date: 5/12/2026; 

Comments: Tracing efforts are ongoing; however, no additional EHV-1 positive horses or horses with clinical signs consistent with EHV-1 have been identified to date.;

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.;