On October 23, 2019, the National Veterinary Services Laboratories in Ames, Iowa confirmed a finding of VSV infection (Indiana serotype) on a premises in Sherman County, Kansas. Three of five horses on the premises were showing clinical signs of VSV and one of the horses met confirmed case definition of an index case in a new state with a VSV-positive complement fixation titer of 1:40 or greater. Two of the affected horses are also PCR-positive for VSV-Indiana. There are 14 cattle on the premises that are clinically unaffected and the premises is currently under state quarantine. This is the 2019 VSV index case for Kansas.
Additionally, since the last situation report (October 17, 2019), there have been 7 new VSV-affected premises (6 confirmed positive, 1 suspect) identified:
Colorado (3 new confirmed positive premises, 1 new suspect premises)
- Garfield County – 2 new confirmed positive premises
- Mesa County – 1 new suspect premises
- Pitkin County (New Infected County) – 1 confirmed positive premises
- Since the last situation report, 6 previously VSV-infected or suspect premises have been released from quarantine.
Nebraska (1 new confirmed positive premises)
- Morrill County – 1 new confirmed positive premises
Texas (1 new confirmed positive premises)
- Collin County – 1 new confirmed positive premises
Utah (1 new confirmed positive premises)
- Carbon County (New Infected County) – 1 confirmed positive 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, Oklahoma, Nebraska, Utah, and Kansas 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), August 9, 2019 (Lincoln County, Nebraska), August 19, 2019 (Emery and Uintah Counties, Utah), and October 23, 2019 (Sherman County, Kansas).
Since the start of the outbreak, 1,131 VSV-affected premises have been identified (462 confirmed positive, 669 suspect). One thousand one hundred nineteen (1,119) of these premises have only equine species clinically affected, 11 premises have only affected cattle (Boulder, Delta, and Larimer County, Colorado; Gonzales County, Texas; Uintah County, Utah; and Hot Springs, Park, and Platte County, Wyoming), and 1 premises has both cattle and horses clinically affected (Park County, Wyoming).
Colorado has identified 686 affected premises (269 confirmed positive, 417 suspect) in 38 counties (Adams, Alamosa, Arapahoe, Archuleta, Boulder, Broomfield, Chaffee, Clear Creek, Conejos, Delta, Dolores, Douglas, Eagle, El Paso, Fremont, Garfield, Gilpin, Grand, Gunnison, Jefferson, La Plata, Larimer, Las Animas, Mesa, Mineral, Moffat, Montezuma, Montrose, Morgan, Ouray, Park, Pitkin, Pueblo, Rio Blanco, San Miguel, Summit, Teller, and Weld Counties).
Kansas has identified 1 affected premises in 1 county (Sherman County).
Nebraska has identified 25 affected premises (15 confirmed positive, 10 suspect) in 4 counties (Dawes, Lincoln, Morrill, and Scotts Bluff Counties).
New Mexico has identified 76 affected premises (47 confirmed positive, 29 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 172 affected premises (76 confirmed positive, 96 suspect) located in 37 counties (Bastrop, Bell, Bosque, Brown, Caldwell, Coleman, Collin, Coryell, Dallas, Eastland, Ellis, Erath, Falls, Gonzales, Guadalupe, Haskell, Hays, Hill, 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).
Utah has identified 23 affected premises (12 confirmed positive, 11 suspect) in 6 counties (Carbon, Duchesne, Emery, Grand, San Juan, and Uintah Counties).
Wyoming has identified 147 affected premises (41 confirmed positive, 106 suspect) in 11 counties (Albany, Big Horn, Carbon, Converse, Fremont, Goshen, Hot Springs, Laramie, Park, Platte, and Sweetwater Counties).
There have been a total of 1,058 previously VSV-infected or suspect premises in all affected states that have completed the quarantine period and been released. All quarantined premises have been released in Oklahoma (since August 7, 2019) and New Mexico (since September 5, 2019).