The summer of 2014 was a rough one for many horses and their owners in Colorado and Texas. A large-scale vesicular stomatitis (VS) outbreak disrupted normal comings and goings, causing extended quarantines and transportation headaches. In the meantime, thousands of horse owners adopted strict biosecurity strategies to prevent disease spread.
This viral disease can affect many livestock species, but it most often shows up in horses and cattle in the southwestern United States. The virus causes vesicles (blisters) to form primarily on the tongue and lips, around the mouth or nose, on the udder or sheath, or along the coronary bands. These virus-containing vesicles later rupture and become lesions. Biting flies, such as black and sand flie
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