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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
Montrose County, CO
Outbreak Identifier: 7546
Alert ID: 5118
August 10, 2026
Confirmed Case(s) - Official Quarantine

USDA-APHIS-Veterinary Services

Comments: Since the last VSV situation report (7/24/2026), 2 new confirmed VSV-positive equine premises have been identified in Montrose County, Colorado. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. 

Updates are as follows: Colorado • Montrose County – 2 new confirmed positive equine premises • Since the last situation report (7/24/2026), 4 previously VSV-affected equine premises have been released from quarantine in Archuleta County (2), La Plata County (1), and Montezuma County (1). 

New Mexico • Since the last situation report (7/24/2026), 2 previously VSV-affected equine premises have been released from quarantine in Rio Arriba and Valencia Counties. 

Since the start of the outbreak, 39 VSV-affected premises have been identified (29 confirmed positive, 10 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 39 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), 8 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/sites/default/files/vsv-sitrep-8-10-26.pdf
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