A Las Animas County, Colo., premises is under quarantine after a horse tested positive for vesicular stomatitis (VS); the horse had not recently traveled and is believed to have been infected by insects.

"While this is the first case diagnosed in Colorado in 2012, there have been several cases identified in the Rio Grande River valley of New Mexico," said Colorado State Veterinarian Keith Roehr, DVM. "This Colorado case represents a northern movement of the virus that has been typical in past years."

In response, the Colorado Department of Agriculture’s (CDA) State Veterinarian’s Office has issued a travel requirement for horse