The USDA Animal and Plant Health Inspection Service (APHIS) released last week the final summary of the vesicular stomatitis (VS) outbreak that occurred in New Mexico and Colorado in 2012. The final quarantines connected to the outbreak were released in late December, according to the summary.

The 2012 VS outbreak began April 30, 2012, when two New Mexico horses tested positive for the disease. At the time, state veterinarian Dave Fly, DVM, told TheHorse.com that those horses were located on a single premises about a mile outside the town of Tularosa. That facility was placed under quarantine.

By July, more than 20 New Mexico horses residing in six counties had tested positive for the disease.

According to the APHIS final summary, a total of 49 New Mexico horses residing on 34 premises in 10 counties tested positive for VS in 2012. The final quarantines had been released as of Dec. 24.

Authorities confirmed the first of Colorado’s two VS cases in 2012 in early August. State authorities placed the two affected premises under quarantine, and both were released by early October.

A viral, foreign animal disease that occurs sporadically in the United States, VS usually appears in southwestern states. The disease, thought to be transmitted by sand flies and black flies, can affect horses, cattle, swine, and occasionally sh