Vesicular Stomatitis Virus Update Through August 1

Since the start of the outbreak, 512 VSV-affected premises have been identified
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VSV map Aug 1 2019

Since the last vesicular stomatitis virus (VSV) last situation report issued July 29 by USDA APHIS Veterinary Services, there have been 146 new VSV-affected premises identified (48 confirmed positive, 98 suspect). No new VSV-affected states have been added to the list.

Following are the new premises by state.

Colorado (28 new confirmed positive prmises and 61 new suspect premises)

  • Archuleta County 6 new suspect premises
  • Boulder County – 2 new confirmed positive and 4 new suspect premises
  • Conejos County (new infected county)1 confirmed positive premises
  • Delta County – 1 new confirmed positive premises
  • Jefferson County – 6 new confirmed positive and 4 new suspect premises
  • La Plata County – 12 new suspect premises
  • Larimer County – 9 new confirmed positive and 13 new suspect premises
  • Mesa County 3 new suspect premises
  • Montezuma County 14 new suspect premises
  • Montrose County (new infected county) – 1 confirmed positive and 1 suspect premises
  • Morgan County – 1 new suspect premises
  • Weld County – 8 new confirmed positive and 3 new suspect premises

Eight previously VSV-infected or -suspect premises have been released from quarantine in La Plata County, Colorado.

New Mexico (4 new confirmed positive premises and 6 new suspect premises)

  • Rio Arriba County – 2 new suspect premises
  • San Juan County (new infected county) – 1 confirmed positive premises
  • San Miguel County -1 new suspect premises
  • Santa Fe County – 1 new suspect premises
  • Taos County 1 new confirmed positive premises
  • Valencia County – 2 new confirmed positive, 2 new suspect premises

Three previously VSV-infected or -suspect premises have been released from quarantine in Valencia County.

Texas (15 new confirmed positive premises and 25 new suspect premises)

  • Bastrop County – 1 new confirmed positive, 16 new suspect premises
  • Caldwell County (new infected county) – 2 confirmed positive and 1 suspect premises
  • Eastland County (new infected county) – 1 confirmed positive premises
  • Gonzales County (new infected county) – 1 confirmed positive premises (cattle affected)
  • Guadalupe County (new infected county) – 1 confirmed positive and 3 suspect premises
  • Lampasas County (New Infected County) – 1 confirmed positive premises
  • Mason County (New Infected County) – 1 confirmed positive premises
  • McLennan County (New Infected County) – 1 confirmed positive premises
  • Mills County (New Infected County) – 1 confirmed positive premises
  • Palo Pinto County – 2 new confirmed positive premises
  • Parker County – 1 new confirmed positive and 1 new suspect premises
  • San Saba County (new infected county) – 1 confirmed positive premises
  • Somervell County - 1 new suspect premises
  • Travis County – 2 new suspect premises
  • Williamson County (new infected county) – 1 confirmed positive and 1 suspect premises

The following previously VSV-infected or -suspect premises have been released from quarantine: 2 in Coleman County, 5 in Hood County, 1 in Shackelford County, 3 in Tom Green County, 1 in Val Verde County, and 1 in Wichita County. 

Wyoming (1 new confirmed positive premises and 6 new suspect premises)

  • Laramie County (new infected county) – 1 confirmed positive premises
  • Platte County – 6 new 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 on June 26 (Sandoval County, New Mexico), July 3, 2019 (Weld County, Colorado), July 24, 2019 (Platte County, Wyoming), and July 29, 2019 (Tillman County, Oklahoma).

Since the start of the outbreak, 512 VSV-affected premises have been identified (222 confirmed positive, 290 suspect). Five hundred ten (510) 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 325 affected premises (130 confirmed positive, 195 suspect) in 14 counties (Adams, Archuleta, Boulder, Broomfield, Conejos, Delta, Jefferson, La Plata, Larimer, Mesa, Montezuma, Montrose, Morgan, and Weld Counties). 

New Mexico has identified 62 affected premises (41 confirmed positive, 21 suspect) in 10 counties (Cibola, Los Alamos, Rio Arriba, Sandoval, San Juan, San Miguel, Santa Fe, Sierra, Taos, and Valencia Counties). 

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

Texas has identified 115 affected premises (47 confirmed positive, 68 suspect) located in 27 counties (Bastrop, Brown, Caldwell, Coleman, Eastland, Gonzales, Guadalupe, 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 9 affected premises in 2 counties (Laramie and Platte Counties). 

There have been a total of 53 previously VSV-infected or suspect premises that have completed the quarantine period and been released in these five states. 

VSV chart premises by species 8-1-19

Information on the VSV outbreak can be followed on the USDA APHIS website.

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