Vesicular Stomatitis Virus Continues to Spread in Horses

Wyoming joined Colorado, New Mexico and Texas as states reported positive VSV horses this year.
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VSV map 7-24-19

On July 24, 2019, the National Veterinary Services Laboratories in Ames, Iowa, confirmed a finding of vesicular stomatitis virus (VSV) infection (Indiana serotype) on an equine premises in Platte County, Wyoming. Horses on the premises have met the case definition of infection with compatible clinical signs and virus isolation positive results. This is the 2019 index case of VSV for Wyoming

According to the USDA APHIS July 24 VSV Situation Report, since the start of the 2019 outbreak 209 VSV-affected premises have been identified (124 confirmed positive, 85 suspect). 

Colorado has identified 134 affected premises (71 confirmed positive, 63 suspect) in 10 counties (Adams, Archuleta, Boulder, Broomfield, Delta, La Plata, Larimer, Montezuma, Morgan and Weld Counties). 

New Mexico has identified 37 affected premises (28 confirmed positive, nine suspect) in six counties (Los Alamos, Rio Arriba, Sandoval, Santa Fe, Taos and Valencia Counties). 

Texas has identified 37 affected premises (24 confirmed positive, 13 suspect) located in 13 counties (Bastrop, Coleman, Hays, Hood, Johnson, Kerr, Kinney, Shackelford, Somervell, Taylor, Tom Green, Val Verde and Wichita Counties). 

There have been a total of 14 previously VSV-infected or suspect premises that have completed the quarantine period and been released. 

Since the last Situation Report (July 18, 2019), the USDA APHIS reported the following: 

Colorado (40 new confirmed positive premises, 38 new suspect premises) 

  • Adams County – 1 new confirmed positive premises 
  • Archuleta County (New Infected County) – 2 confirmed positive, 1 suspect premises 
  • Boulder County – 8 new confirmed positive, 3 new suspect premises 
  • Broomfield County – 1 new suspect premises 
  • Delta County (New Infected County) – 1 confirmed positive premises 
  • La Plata County – 5 new confirmed positive, 6 new suspect premises 
  • Larimer County – 14 new confirmed positive, 25 new suspect premises 
  • Montezuma County (New Infected County) – 1 confirmed positive premises 
  • Morgan County (New Infected County) – 1 confirmed positive premises 
  • Weld County – 7 new confirmed positive, 2 new suspect premises 
  • The following previously VSV-infected or suspect premises have been released from quarantine: 1 in Larimer County and 2 in Weld County 

New Mexico (1 new confirmed positive, 6 new suspect premises) 

  • Rio Arriba County – 1 new suspect premises 
  • Santa Fe County – 2 new suspect premises 
  • Valencia County – 1 new confirmed positive, 3 new suspect premises 
  • The following previously VSV-infected premises have been released from quarantine: 1 in Los Alamos County and 3 in Sandoval County 

Texas (4 new confirmed positive, 11 new suspect premises) 

  • Bastrop County – 2 new confirmed positive, 10 new suspect premises 
  • Hays County – 1 new suspect premises 
  • Hood County – 1 new confirmed positive premises 
  • Somervell County (New Infected County) – 1 confirmed positive premises 
VSV 2019 timeline of events 7-24-19

For a summary chart with location, number and status of VSV-affected premises in affected states, please download the entire July 24 VSV report here.

Please note that humans can be affected by the vesicular stomatitis virus, so please use proper biosecurity when handling horses with suspect or active lesions.

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