Disease Alerts

Number Confirmed: 1; 
Number Suspected: 3; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 18; Gender: Mare; Breed: Paint; Onset of Clinical Signs: 6/14/2026; Clinical Signs: The mare was referred to an equine hospital for evaluation and treatment of fever, diarrhea, and systemic inflammatory response syndrome. She was admitted under isolation protocol, and has improved with treatment. Fecal samples collected at hospital admission were positive on PCR and culture for Salmonella. Several other horses on the farm have been treated for fever, diarrhea, and/or colic in the last week.; Confirmation Date: 6/18/2026; Horse Status: Affected And Alive;

Number Confirmed: 1; 
Number Exposed: 2; 
Facility Type: Private Facility; 

Horse 1: 
Clinical Signs: The mare presented with clinical signs of vestibular disease, including head tilt and circling to the left. Diagnostics were returned negative for EPM, but positive to EHV-1 on PCR of whole blood. Two other horses are exposed, but are not showing clinical signs. The mare has improved with treatment.; Confirmation Date: 6/19/2026; Horse Status: Affected And Alive;

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

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; 
Facility Type: Private Facility; 
Comments: 23 yr old Horse under vet care.;

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 12; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 5/30/2026; Clinical Signs: ataxic, dragging RF foot, mild craniofacial deficits; Confirmation Date: 6/5/2026; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;

Comments: The first (1st) equine case of West Nile Virus in California in 2026 was confirmed in San Luis Obispo County. On June 5, 2026, a 12-year-old Quarter Horse in San Luis Obispo County with unknown vaccine history displaying neurologic signs was confirmed positive for West Nile Virus. The gelding is alive and recovering.;

Comments: Since the last VSV situation report (6/10/2026), four (4) new VSV-affected equine premises have been confirmed positive in Valencia 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 • No new VSV-affected premises have been identified. New Mexico • Valencia County (New Affected County) – 4 new confirmed VSV-positive equine premises have been identified. Since the start of the outbreak, 23 VSV-affected premises have been identified (22 confirmed positive, 1 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 23 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 7 premises located in 3 New Mexico counties (Sandoval, Santa Fe, and Valencia Counties). 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, and in New Mexico (goats on 2 premises) in Sandoval and Valencia Counties, but they were not clinically affected.;

For more information, go to https://www.aphis.usda.gov/sites/default/files/vsv-sitrep-6-12-26.pdf

Number Confirmed: 2; 
Number Exposed: Unknown;

Number Confirmed: 2; 
Number Suspected: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Under veterinary care.;

Comments: Since the last VSV situation report (5/26/2026), one new VSV-affected equine premises has been confirmed positive in Santa Fe 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 • No new VSV-affected premises have been identified. Since the last situation report (5/26/2026), 1 previously VSV-affected premises was released from quarantine in Montezuma County, New Mexico • Santa Fe County (New Affected County) – 1 new confirmed VSV-positive equine premises has been identified. • Since the last situation report (5/26/2026), 2 previously VSV-affected equine premises have been released from quarantine in Sandoval County (1 confirmed positive and 1 presumptive positive premises). Since the start of the outbreak, 19 VSV-affected premises have been identified (18 confirmed positive, 1 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 19 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 3 premises located in 2 New Mexico counties (Sandoval and Santa Fe Counties). 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/sites/default/files/vsv-sitrep-6-10-26.pdf