Vesicular stomatitis outbreak continues unabated

vsv-august19-updateThe outbreak of vesicular stomatitis affecting Colorado and Texas shows no signs of abating, with 343 horses infected since May.

The majority of cases in horses – 265 – have been in Colarado, with 78 reported in Texas. The outbreak has also affected three cattle in Colorado and seven in Texas.

Latest figures released by the Animal and Plant Health Inspection Service, a division of the US Department of Agriculture, showed the majority of recent cases have been in Colorado.

Its August 20 update revealed 55 new premises had been confirmed across the two states since its last update, on August 13. Fifty-three of those properties were in Colorado and two in Texas.

APHIS gave the following breakdown of the latest cases.


  • Bastrop County, Texas – 2 horses on 2 premises


  • Adams County, Colorado – 8 horses on 7 premises
  • Boulder County, Colorado – 13 horses on 12 premises
  • Jefferson County, Colorado– 5 horses on 5 premises
  • Larimer County, Colorado – 19 horses on 18 premises
  • Weld County, Colorado – 15 horses on 11 premises

To date, 241 premises with positive cases have been identified in the two states, with 186 of them in Colorado and 55 in Texas.

Eight counties have been affected in Colorado: Adams, Boulder, Broomfield, Douglas, El Paso, Jefferson, Larimer, and Weld.

Eleven counties have been affected in Texas: Bastrop, Falls, Guadalupe, Hidalgo, Jim Wells, Kinney, Nueces, San Patricio, Travis, Val Verde, and Williamson.

Of the 241 positive premises, 234 have involved horses and seven have involved cattle.

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

To date, 11 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, and 1 in Travis County.

Two premises in Colorado have been released from quarantine: 1 in Boulder County and 1 in Weld County).

There are 30 further properties in Texas and 49 in Colorado on a 21-day countdown to quarantine release.



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