Animal and Plant Health Inspection Service, Veterinary Services
Comments: Since the last VSV situation report (8/13/2026), three presumptive positive equine premises in La Plata County and Montezuma County, Colorado, have been quarantined. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: • La Plata County – 1 new presumptive positive equine premises • Montezuma County – 2 new presumptive positive equine premises. Since the last situation report (8/13/2026), 1 previously VSV-affected equine premises has been released from quarantine in La Plata County. Since the start of the outbreak, 45 VSV-affected premises have been identified (31 confirmed positive, 14 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. Forty-three (43) premises have had only equine species clinically affected Of the 45 affected premises, 15 were located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 14 premises were located in 5 Colorado counties (Archuleta, Delta, La Plata, Montezuma, and Montrose Counties), and 16 premises were 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