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Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.



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Vesicular Stomatitis
Archuleta and Montezuma County, CO
Outbreak Identifier: 7516
Alert ID: 5086
July 24, 2026
Confirmed Case(s) - Official Quarantine

USDA-APHIS-Veterinary Services

Comments: Since the last VSV situation report (7/20/2026), 2 new presumptive positive equine premises have been quarantined, 1 in Archuleta County and 1 in Montezuma County, Colorado. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. 

Updates are as follows: Colorado • Archuleta County – 1 new presumptive positive equine premises • Montezuma County – 1 new presumptive positive equine premises New Mexico • VSV-affected premises remain quarantined in Rio Arriba County and Valencia County, New Mexico 

Since the start of the outbreak, 37 VSV-affected premises have been identified (27 confirmed positive, 10 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 37 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), 6 premises located in 4 Colorado counties (Archuleta, La Plata, Montezuma, and Montrose Counties), and 16 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
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