August 9 Report Shows VSV Continues to Spread

Nebraska joins vesicular stomatitis virus-positive states; 156 new VSV-positive premises reported since August 1.
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VSV quarantined counties 8-9-19

On August 9, 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 Lincoln County, Nebraska. One horse on the premises has met VSV case definition with compatible clinical signs and a four-fold increase in complement fixation titer on paired sera. The affected horse is also PCR-positive for VSV (Indiana serotype) on swab samples collected from lesions. This is the 2019 VSV index case for Nebraska. 

Additionally, since the last situation report on August 1, there have been 156 new VSV-affected premises identified (67 confirmed positive, 89 suspect).

Colorado (50 new confirmed positive premises, 64 new suspect premises) 

  • Adams County – 4 new confirmed positive, 3 new suspect premises 
  • Alamosa County (new infected county) – 1 confirmed positive premises
  • Archuleta County – 3 new confirmed positive, 1 new suspect premises 
  • Boulder County – 2 new confirmed positive, 5 new suspect premises 
  • Delta County – 1 new confirmed positive, 8 new suspect premises 
  • Douglas County (new infected county) – 4 confirmed positive premises 
  • Gilpin County (new infected county) – 1 confirmed positive premises 
  • Grand County (new infected county) – 1 confirmed positive premises 
  • Jefferson County – 11 new confirmed positive, 4 new suspect premises 
  • La Plata County – 3 new confirmed positive, 6 new suspect premises 
  • Larimer County – 5 new confirmed positive, 9 new suspect premises 
  • Mesa County – 3 new confirmed positive, 12 new suspect premises 
  • Montezuma County – 1 new confirmed positive, 6 new suspect premises • Montrose County – 1 new confirmed positive, 3 new suspect premises 
  • Morgan County – 1 new suspect premises 
  • Ouray County (new infected county) – 1 confirmed positive premises • Pueblo County (new infected county) – 2 confirmed positive, 2 suspect premises 
  • Weld County – 6 new confirmed positive, 4 new suspect premises 
  • 134 previously VSV-infected or suspect premises have been released from quarantine since the last situation report. 

New Mexico (3 new confirmed positive premises, 3 new suspect premises) 

  • Mora County (new infected county) – 1 confirmed positive premises 
  • Sandoval County -1 new confirmed positive premises 
  • San Juan County – 2 new suspect premises 
  • Santa Fe County – 1 new suspect premises 
  • Socorro County (new infected county) – 1 confirmed positive premises 
  • 44 previously VSV-infected or suspect premises have been released from quarantine since the last situation report. 

Oklahoma (no new confirmed positive or suspect premises) 

  • 1 previously VSV-infected premises in Tillman County has been released from quarantine. 

Texas (11 new confirmed positive premises, 17 new suspect premises) 

  • Bastrop County – 2 new confirmed positive, 3 new suspect premises 
  • Bell County (new infected county) – 1 confirmed positive premises 
  • Coryell County (new infected county) – 1 confirmed positive premises 
  • Erath County (new infected county) – 1 confirmed positive, 1 suspect premises 
  • Falls County (new infected county) – 1 confirmed positive premises 
  • Guadalupe County – 1 new suspect premises 
  • Haskell County (new infected county) – 1 confirmed positive premises 
  • McLennan County – 3 new suspect premises 
  • Palo Pinto County – 2 new confirmed positive, 1 new suspect premises 
  • Parker County – 1 new confirmed positive premises 
  • Travis County – 5 new suspect premises 
  • Williamson County – 1 new confirmed positive, 3 new suspect premises 
  • 27 previously VSV-infected or suspect premises have been released from quarantine since the last situation report. 

Wyoming (3 new confirmed positive premises, 5 new suspect premises) 

  • Converse County (new infected county) – 2 confirmed positive, 1 suspect premises 
  • Platte County – 1 new confirmed positive, 4 new suspect premises 
  • 1 previously VSV-infected premises in Platte County has been released from quarantine. 

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, Oklahoma and Nebraska subsequently broke with cases which were confirmed by NVSL on June 26, 2019 (Sandoval County, New Mexico), July 3, 2019 (Weld County, Colorado), July 24, 2019 (Platte County, Wyoming), July 29, 2019 (Tillman County, Oklahoma), and August 9, 2019 (Lincoln County, Nebraska). 

Since the start of the outbreak, 665 VSV-affected premises have been identified (290 confirmed positive, 375 suspect). Six hundred sixty-three (663) of these premises have only equine species clinically affected and 2 premises have affected cattle (Boulder County, Colorado and Gonzales County, Texas). 

Colorado has identified 435 affected premises (180 confirmed positive, 255 suspect) in 20 counties (Adams, Alamosa, Archuleta, Boulder, Broomfield, Conejos, Delta, Douglas, Gilpin, Grand, Jefferson, La Plata, Larimer, Mesa, Montezuma, Montrose, Morgan, Ouray, Pueblo and Weld Counties). 

Nebraska has identified 1 affected premises in 1 county (Lincoln County). 

New Mexico has identified 68 affected premises (44 confirmed positive, 24 suspect) in 12 counties (Cibola, Los Alamos, Mora, Rio Arriba, Sandoval, San Juan, San Miguel, Santa Fe, Sierra, Socorro, Taos and Valencia Counties). 

Oklahoma has identified 1 affected premises in 1 county (Tillman County). 

Texas has identified 143 affected premises (58 confirmed positive, 85 suspect) located in 32 counties (Bastrop, Bell, Brown, Caldwell, Coleman, Coryell, Eastland, Erath, Falls, Gonzales, Guadalupe, Haskell, Hays, Hood, Johnson, Kerr, Kinney, Lampasas, Mason, McLennan, Mills, Palo Pinto, Parker, San Saba, Shackelford, Somervell, Taylor, Tom Green, Travis, Val Verde, Wichita and Williamson Counties). 

Wyoming has identified 17 affected premises (6 confirmed positive, 11 suspect) in 3 counties (Converse, Laramie and Platte Counties). 

There have been a total of 260 previously VSV-infected or suspect premises that have completed the quarantine period and been released.

The complete August 9 summary from USDA APHIS can be found here.

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