Disease Alerts

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: From the Referring Veterinarian: Owner had this patient's mare at a breeding facility returned (two weeks prior to examination) with upper respiratory signs. Mare was immediately placed back with this patient. Suspect the mare is carrier. This is this patient's second positive test, with the previous one performed in Sept '25 at UC-Davis. Later had a < 1:200 S. equi equi titer in March '26 to assess risk for Purpura Hemorrhagica prior to immunizing. Mare had titers performed at the same time with a result of 1:800.;

Number Confirmed: 1; 
Number Exposed: 7; 

Horse 1: 
Age: 25; Gender: Mare; Breed: Pony; Onset of Clinical Signs: 6/29/2026; Clinical Signs: This mare developed sudden neurologic signs (ataxia , urine dribbling) on the evening of June 29. Her signs progressed the next day and she was euthanized. The mare had been at a schooling show in the Regional Municipality of Peel on June 28. The mare was kept outside at all times. The risk to other horses competing at the show is considered low, however, out of an abundance of caution, owners or custodians of horses attending the show should monitor the health of their horses over the next 14 days, including rectal temperature, which should be interpreted in the context of the extreme heat wave the region is experiencing. Owners should contact their veterinarian with any concerns about their horse.; Horse Status: Euthanized; 

Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present EHV-1 neurologic (EHM) cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.;

Comments: Since the last VSV situation report (6/30/2026), one (1) new VSV-affected equine premises has been confirmed positive in Montrose County, Colorado (New Affected County). All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: Colorado • Montrose County (New Affected County) – 1 new confirmed positive equine premises has been quarantined New Mexico • VSV-affected equine premises remain quarantined in Rio Arriba and Valencia Counties. Since the start of the outbreak, 30 VSV-affected premises have been identified (25 confirmed positive, 5 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 30 premises have had only equine species clinically affected with 15 premises located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 2 premises located in 2 Colorado counties (Montezuma and Montrose Counties), and 13 premises located in 4 New Mexico counties (Rio Arriba, Sandoval, Santa Fe, and Valencia Counties).;

For more information, go to https://www.aphis.usda.gov/livestock-poultry-disease/cattle/vesicular-stomatitis

Comments: Since the last VSV situation report (6/26/2026), one (1) new VSV-affected equine premises has been confirmed positive in Rio Arriba County, New Mexico (New Affected County). All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: Arizona • The last VSV-quarantined premises in Arizona was released on 4/20/2026 and no new cases have been identified to date. Colorado • The last VSV-quarantined premises in Colorado was released on 5/26/2026 and no new cases have been identified to date. New Mexico • Rio Arriba County (New Affected County) – 1 new confirmed positive equine premises • Since the last situation report (6/26/2026), 5 previously VSV-affected equine premises have been released from quarantine in Santa Fe County (1) and Valencia County (4). Since the start of the outbreak, 29 VSV-affected premises have been identified (24 confirmed positive, 5 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 29 premises have had only equine species clinically affected with 15 premises located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 1 premises located in 1 Colorado county (Montezuma County), and 13 premises located in 4 New Mexico counties (Rio Arriba, Sandoval, Santa Fe, and Valencia Counties).;

For more information, go to https://www.aphis.usda.gov/livestock-poultry-disease/cattle/vesicular-stomatitis

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: 1; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Private Facility; 
Comments: This is the second confirmed EEE case for Florida in 2026.;

Number Confirmed: 1; 
Number Exposed: 5; 
Facility Type: Private Facility; 
Comments: This is the 17th confirmed premises with strangles for Florida in 2026.;

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.;