Animal health officials have confirmed that two Arizona horses and a Utah mule have tested positive for vesicular stomatitis (VS).

The Arizona Department of Agriculture reported May 1 that two horses residing in Maricopa County, in the East Valley, had tested positive for the virus. Additional testing is underway on animals residing at eight Maricopa County facilities, a department statement said.

In Utah, that state’s Department of Agriculture and Food reported May 5 that a mule residing in Kane County has tested positive for VS. Four horses are showing signs of VS and are undergoing tests. An additional nine horses could have had contact with the mule and four horses. All of the suspect animals are in isolation and under quarantine.

The infected Utah animals traveled from Arizona and arrived in Utah with some of the animals showing signs of disease, a Utah Department of Agriculture and Food statement said.

The confirmation of the disease has prompted a mandatory quarantine of all 14 animals by Acting Utah State Veterinarian Warren Hess, DVM.

The Utah VS discovery comes during the Mt. Carmel XP horse endurance/trail event held April 29 to May 3. All participants in the event are encouraged to examine their animals for signs of vesicular stomatitis and report any signs of disease to your local veterinarian or the Utah Department of Agriculture and Food at 801/538-4910.

New Mexico has also recently confirmed VS in horses in that state. 

Vesicular stomatitis s a livestock disease that primarily affect