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Texas vesicular stomatitis situation update, 8-2-19

Source: Texas Animal Health Commission | 8-2-19

Since Friday, July 26, 2019, the Texas Animal Health Commission has received reports of 16 new confirmed cases of vesicular stomatitis virus (VSV) and 65 new suspect cases. All cases of VSV had been found on equine premises until July 30, 2019, when the first case of VSV was confirmed in cattle in Gonzales County. 

The newly confirmed and suspect premises are under quarantine by the TAHC. Affected horses and cattle will be monitored by regulatory and authorized veterinarians until premises are eligible for quarantine release 14 days after clinical VSV signs are observed.

Classification of Cases
Premises that have laboratory diagnostic confirmation of VSV are categorized as confirmed positive premises. Once a county is confirmed as VSV-positive, new premises presenting with clinical signs of VSV in that county are not required to be tested for confirmation of the disease, but the premises will be quarantined and classified as a suspect premises.

Summary of the Outbreak
The 2019 VSV outbreak began on June 21, 2019, when the National Veterinary Services Laboratories (NVSL) in Ames, Iowa confirmed the first VSV-positive premises in Kinney County, Texas. New Mexico, Colorado, Wyoming, and Oklahoma subsequently broke with cases which were confirmed by NVSL.

To date, 114 premises in 27 Texas counties have been quarantined for VSV. Currently affected counties include: Bastrop, Brown, Caldwell, Coleman, Eastland, Gonzales, Guadalupe, Hays, Hood, Lampasas, Mason, McLennan, Mills, Palo Pinto, Parker, San Saba, Shackelford, Somervell, Taylor, Travis, and Williamson counties. Of the 114 premises quarantined,16 have been released.

* First VSV-positive cattle case in Texas this year.

What Equine and Cattle Owners Need to Know:

  • VSV is a viral disease that primarily affects horses and cattle. 
  • In the past decade, the Southwestern and Western United States have experienced a number of VSV outbreaks. Outbreaks usually occur during the warmer months, often along waterways. 
  • VSV normally has an incubation period of 2-8 days before the infected animal develops blisters that swell and burst, leaving painful sores. The virus can be transmitted through direct contact with infected animals or by blood-feeding insects. 
  • If VSV is confirmed, infected animals are quarantined for 14 days after clinical signs of lesions are observed. This short-term quarantine helps prevent the movement of animals and the spread of the disease to other premises, fairs or markets.

Strategies for Preventing VSV 

Even with the best defensive measures, VSV could infect a herd. However, these tips may help protect livestock:

  1. Control biting flies
  2. Keep equine animals stalled or under a roof at night to reduce exposure to flies
  3. Keep stalls clean
  4. Feed and water stock from their individual buckets
  5. Don’t visit a ranch that’s under quarantine for VSV. Wait until the animals have healed 

For more information about VSV visit https://www.tahc.texas.gov/news/brochures/TAHCBrochure_VS.pdf.  

A USDA APHIS-VS fact sheet about Vesicular Stomatitis is available at http://www.aphis.usda.gov/publications/animal_health/content/printable_version/fs_vesicular_stomatitis_2012.pdf

Written by:
kristin
Published on:
August 5, 2019

Categories: Animal Health, Livestock Management, Natural Resources, Ranching, The Cattleman Now, The Cattleman Now - App

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