ALBUQUERQUE, N.M. (AP) -- New Mexico livestock owners are being urged to take precautions against a severe strain of a virus that causes outbreaks in horses and other animals.

The New Mexico Livestock Board and the state veterinary warned of the possible spreading of vesicular stomatitis, particularly along the Rio Grande.

Officials say suspected cases of VS were reported last week in San Miguel and Socorro counties. Nine areas in Valencia County are under quarantine. The first confirmed case this year was in April in Otero County.

VS causes painful blisters on the lips and tongue of horses, cattle, donkeys, mules and pigs. Afflicted animals may not eat for a day or two.

To help prevent the spread of the virus, the state veterinarian's office recommends using insect repellants, checking animals daily for signs of the virus and avoiding travel to areas where the virus is documented or at risk.

Copyright 2012 The AP.