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Vesicular Stomatitis (VSV) in Texas Situational Update

published: September 16th 2019
source: Texas Animal Health Commission
AUSTIN – Since Friday, September 6, 2019, the Texas Animal Health Commission (TAHC) has received a report of 1 new suspect vesicular stomatitis virus (VSV) case in Ellis County. Ellis County is now the only county with a VSV quarantine.
The premises is under quarantine by the TAHC. The equine will be monitored by regulatory and authorized veterinarians until the premises is eligible for quarantine release 14 days after clinical VSV signs are observed.
 
To date, 171 premises in 37 Texas counties have been quarantined for VSV. Of the 171 premises quarantined, 170 have been released.
 
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. 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. New Mexico, Colorado, Nebraska, Oklahoma, Utah, and Wyoming broke with VSV cases confirmed by NVSL. 
What Veterinarians Need to Know:
What Equine and Cattle Owners Need to Know:
  • VSV is a viral disease that primarily affects horses and cattle.
  •  In the past decade, southwestern and western 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
  1. Even with the best defensive measures, VSV could infect a herd. However, these tips may help protect livestock:
  2. Control biting flies
  3. Keep equine animals stalled or under a roof at night to reduce exposure to flies
  4. Keep stalls clean
  5. Don’t visit a ranch that’s under quarantine for VSV. Wait until the animals have healed
 

 

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