05/14/2026
VSV Case Confirmed in Montezuma County in Colorado Equine.
VSV Case Confirmed in Colorado Equine
As of Monday, May11, the Colorado State Veterinarian’s Office has confirmed a detection of vesicular stomatitis virus (VSV) https://ag.colorado.gov/animal-health/reportable-diseases/vesicular-stomatitis-virus-vsv in a horse in Montezuma County, with two additional horses showing clinical signs.
This viral disease primarily affects horses and cattle, and occasionally swine, sheep, goats, llamas, and alpacas. The disease can be transmitted by insects such as black flies, sand flies, and biting midges or through direct contact with infected animals or contaminated objects. The incubation period ranges from 2-8 days. Clinical signs include blister-like sores on the mouths and feet of infected animals and appear similar to foot and mouth disease. Often excessive salivation is the first sign of disease, along with a reluctance to eat or drink. Lameness and weight loss may follow. There are no USDA-approved vaccines for VSV. https://www.aphis.usda.gov/livestock-poultry-disease/cattle/vesicular-stomatitis
What should livestock owners do?
Equine and livestock owners should monitor their animals for blisters and report any suspected cases to their veterinarian, who will then coordinate with the State Veterinarian’s Office in Colorado for testing and follow-up.
Tips for livestock owners
Strict fly control is an important factor to inhibit the transmission of the disease.
Avoid transferring feeding equipment, cleaning tools or health care equipment from other herds.
When moving livestock interstate, Colorado veterinarians and livestock owners should contact the Animal Health Officials in the destination state to ensure all import requirements are met.https://usaha.org/wp-content/uploads/2026/02/STATE_ANIMAL_HEALTH_OFFICIALS.pdf
Colorado fairs, livestock exhibitions, and rodeos may institute new entry requirements based on the extent and severity of the current VS outbreak. Certificates of veterinary inspection (CVIs or health certificates) issued within 2-5 days prior to an event can be beneficial in reducing risks.
See these Guidelines for Fairs, Shows, Exhibitions for more information https://docs.google.com/document/d/14-MqLOofkfJpT9YLz2zUg52uB0BE9n_JUPlwRYhFM-I/edit?tab=t.0 =h.3euyo4etpl9b
For specific recommendations or if you have concerns about your livestock contact your local veterinarian.
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