CSU ext

Vesicular Stomatitis (VS) is a viral disease originating in Central America that periodically spreads northward into Mexico and the United States in the spring and summer months. It is not typically a zoonotic disease, although people working closely with infected animals may become infected with the virus. Typically the virus infects cattle, pigs, horses and rarely sheep, goats and llamas. Since it closely resembles foot and mouth disease in cattle, it is vitally important to have the disease correctly identified.

mouth lesions
VS mouth lesions in a cow

How is it transmitted?  ‘VS’ as it is often called is transmitted from animal to animal through biting insects and by direct contact with infected animals. Saliva from animals with ulcers in their mouth is infectious. Wear gloves when handing infected animals.

VS lesion on a horses tounge
VS on a horse tounge
What are the signs in animals?   Blisters (vesicles), ulcers, and erosions of the lips, gums and tongue that cause excessive salivation and difficulty in eating. Horses and occasionally cattle will develop lesions on the coronary bands causing lameness. In cows, the teats typically have blisters and erosions and can result in secondary mastitis.
The importance of ‘VS’ is that it looks like Foot and Mouth disease in cattle, a highly contagious foreign animal disease that requires immediate diagnosis and eradication.
Any animal with oral ulcers should be seen by a veterinarian for verification, and should not be admitted to the show or fair until it is confirmed to not have a contagious disease.

lesions on horse feet
VS lesions on the cornary bands of a horse

More information at Merck Vet Manual: