Disease Alerts

Number Confirmed: 1; 
Number Exposed: 1; 

Horse 1: 
Age: 3; Gender: Mare; Breed: Grade; Onset of Clinical Signs: 5/25/2026; Clinical Signs: Fever, cough; Confirmation Date: 5/28/2026; Horse Status: Affected And Alive; Vaccination Status: Undervaccinated;

Comments: This horse is positive for Equine Influenza, EHV-1 Respiratory, and EHV-4 Respiratory. 

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

Horse 1: 
Age: 5; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 5/15/2026; Clinical Signs: Lethargy and intermittent fever; Confirmation Date: 5/27/2026; Horse Status: Recovering; Vaccination Status: Undervaccinated;

Number Confirmed: 2; 
Number Suspected: 4; 
Number Exposed: 50; 
Facility Type: Boarding Facility; 
Comments: Horses tested positive 5-22-26, had symptoms for a week before exam and testing.;

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

Comments: On May 22, 2026, the National Veterinary Services Laboratories (NVSL) in Ames, Iowa, confirmed vesicular stomatitis New Jersey virus (VSNJV) on an equine premises in Sandoval County, New Mexico. One (1) horse out of 3 horses on the premises had compatible clinical signs and was VSNJV-positive by both polymerase chain reaction (PCR) on swabs of the lesions and competitive enzyme-linked immunosorbent assay (cELISA) on serology. This is the index case of VSV for New Mexico in 2026. Additionally, since the index case was confirmed, a second equine premises in Sandoval County, New Mexico, has horses exhibiting compatible clinical signs of VSV and has been categorized as presumptive positive without testing. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Since the start of the outbreak, 18 VSV-affected premises have been identified (17 confirmed positive, 1 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 18 premises have had only equine species clinically affected in six Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 1 premises in 1 Colorado county (Montezuma County), and 2 premises in 1 New Mexico county (Sandoval County).;

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

Number Confirmed: 1; 
Number Exposed: Unknown; 
Facility Type: Private Facility; 
Comments: Delayed reporting. Horse was under vet care and managed.;

Number Confirmed: 1; 
Number Exposed: Unknown;

Number Confirmed: 1; 
Number Exposed: 3; 
Facility Type: Private Facility; 

Horse 1: 
Age: Yearling; Gender: Gelding; Breed: Miniature Horse; Clinical Signs: Respiratory noise, dried nasal discharge, fever, weight loss, lethargy.; Confirmation Date: 5/21/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

Comments: The horse was positive for both influenza and strangles. Horse came from a local dealer/kill pen rescue.

Number Confirmed: 1; 
Number Exposed: 2;

Number Confirmed: 2; 
Number Suspected: Unknown; 
Number Exposed: 70; 
Facility Type: Private Facility;