Another 34 horses confirmed with vesicular stomatitis in last week

vs-sept3Another 34 horses have been confirmed with vesicular stomatitis in Colorado and Texas in the last week, the latest federal update shows. A total of 426 horses have contracted the disease since the outbreak began in May.

The Animal and Plant Health Inspection Service, a division of the US Department of Agriculture, said 26 new positive equine premises had been identified in Colorado and one in Texas since its last update a week ago.

It said in its September 3 report that all cases had been confirmed as the New Jersey serotype.

The department gave the following county-by-county breakdown of cases in the last week:


  • McLennan County, Texas (newly affected county) – 3 horses on 1 premises


  • Adams County, Colorado – 1 horse on 1 premises
  • Boulder County, Colorado – 4 horses on 4 premises
  • Jefferson County, Colorado– 8 horses on 6 premises
  • Larimer County, Colorado -9 horses on 9 premises
  • Morgan County, Colorado (newly affected county) – 3 horses on 1 premises
  • Weld County, Colorado – 6 horses on 5 premises

No new cases in cattle have been confirmed in the last week.

To date, a total of 306 positive premises have been identified in the two states – 248 in Colorado and 58 in Texas.

There have been nine counties affected in Colorado (Adams, Boulder, Broomfield, Douglas, El Paso, Jefferson, Larimer, Morgan and Weld Counties) and 12 counties affected in Texas (Bastrop, Falls, Guadalupe, Hidalgo, Jim Wells, Kinney, McLennan, Nueces, San Patricio, Travis, Val Verde, and Williamson Counties).

Of the 306 positive premises, 296 have been positive equine premises, eight have been positive bovine premises, and two premises have had both cattle and horses positive.

Positive premises are eligible for quarantine release 21 days after lesions have healed in all affected animals.

To date, 23 premises in Texas have been released from quarantine (1 in Kinney County, 2 in Nueces County, 2 in San Patricio County, 2 in Hidalgo County, 1 in Jim Wells County, 1 in Val Verde County, 1 in Guadalupe County, 8 in Travis County, 4 in Bastrop County, and 1 in Williamson County); and 40 premises in Colorado have been released (10 in Boulder County, 29 in Weld County, and 1 in Adams County).

There are a further 23 premises in Texas and 69 in Colorado on a 21-day countdown to quarantine release.

Of the 426 horse cases confirmed so far, 344 were in Colorado and 82 were in Texas. A total of 15 cattle have been confirmed as infected – seven in Colorado and eight in Texas.

The first case in Texas was confirmed by laboratory testing on May 23, and the first Colorado case was confirmed on July 17.

Vesicular stomatitis can cause blisters and sores in the mouth and on the tongue, muzzle, teats or hooves of horses, cattle, swine, sheep, goats, llamas and a number of other animals.

Lesions usually heal in two or three weeks.

Because of the contagious nature of the disease, animal health officials urge livestock owners and caretakers to report these symptoms to their veterinarian immediately.

Most animals recover well with supportive care by a veterinarian, but some lesions can be painful.

It is thought that insects are an important vector in the transmission of the disease.


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