Equine VS Case Confirmed in Wyoming

The Wyoming State Veterinary Lab has verified that the country’s first case of vesicular stomatitis (VS) for 2006 has been confirmed in a Natrona County horse. The following was released by USDA’s Animal Plant and Health Inspection

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The Wyoming State Veterinary Lab has verified that the country’s first case of vesicular stomatitis (VS) for 2006 has been confirmed in a Natrona County horse. The following was released by USDA’s Animal Plant and Health Inspection Service.


The USDA’s National Veterinary Services Laboratories (NVSL) in Ames, Iowa, today confirmed vesicular stomatitis in a 10-year-old horse on a premises in Natrona County, Wyo. (near Casper). This is the first confirmed case of vesicular stomatitis in the United States in 2006; the last case of VS was confirmed in late 2005.


Vesicular stomatitis is a viral disease which primarily affects horses, cattle, and swine.The viruses that cause VS have a wide host range. VS also occasionally affects sheep and goats. In affected livestock, VS causes blister-like lesions to form in the mouth and on the dental pad, tongue, lips, nostrils, hooves, and teats. These blisters swell and break, leaving raw tissue that is so painful that infected animals generally refuse to eat and drink, and show signs of lameness. Weight loss usually follows, and in dairy cows, a drop in milk production commonly occurs. Affected livestock might appear to be clinically normal and continue to eat, but may consume only about half of their normal quantity of feed.


The clinically ill horse was positive for antibodies to vesicular stomatitis New Jersey (VS-NJ) virus on the competitive enzyme-linked immunosorbent assay (cELISA) and was also positive on virus isolation for VS-NJ virus. The VS compatible clinical signs and presence of VS-NJ virus meet the definition to classify this horse as the index case for the Nation in 2006. There are an additional 29 clinically normal horses and 25 clinically normal cattle also on the  premises

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