08/21/2026
Vesicular stomatitis is active again this season. As of July, USDA APHIS has confirmed new cases across several counties in New Mexico and Colorado, with additional premises under investigation.
VSV moves through insect vectors and can affect horses, donkeys, mules, cattle, and swine. For show and competition horses, a confirmed case can mean movement restrictions and quarantine at the premises level, not just a treatment question.
If you're managing horses traveling this season, checking current case maps before a trip is worth the two minutes it takes.
Vesicular stomatitis is a viral disease of horses, donkeys, mules, cattle, swine and New World camelids that occurs in the Western Hemisphere. The disease is named for the characteristic vesicular lesions it causes in the form of blisters, crusts and ulceration of the lips, muzzle, nose, tongue, ear...