Three horses all on a single premise in Cochise County, Ariz., remain the only horses in the country currently diagnosed with vesicular stomatitis (VS) virus.

VS is a disease that causes blister-like lesions in the mouth and on the dental pad, tongue, lips, nostrils, hooves, prepuce, and teats of livestock in the southwestern United States.

"Arizona hasn't had a case since 2005," reported John Hunt, DVM, from the Arizona Department of Agriculture.

The three horses were all diagnosed at the end of May and no new cases have been reported. The United States Department of Agriculture is monitoring the VS situation and regularly updated information regarding the number of positive horses and positive premises in Arizona and other states is available online

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