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2019 Vesicular Stomatitis Virus (VSV)

Situation Report – January 6, 2020

Information current as of 6:00pm MDT, 01/06/2020

VSV-positive premises were confirmed during the 2019 outbreak year in 8 states: Colorado, Kansas, 

Nebraska, New Mexico, Oklahoma, Texas, Utah, and Wyoming. 

As of December 27, 2019, all VSV-affected premises have been released from quarantine in all 

previously affected states. 

Since the last situation report (December 19, 2019), there have been no new VSV-affected

premises identified. Additional updates for affected states are as follows:

Wyoming

• Since the last situation report, 6 previously VSV-infected or suspect premises 

have been released from quarantine. 

• There are currently no VSV-affected premises under quarantine in Wyoming

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 equine 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. Premises not meeting 

diagnostic confirmed case definition, but showing some evidence of recent VSV infection on testing 

may also be classified as suspect premises. 

Quarantines

Confirmed positive and suspect premises are quarantined for at least 14 days from the onset 

of lesions in the last affected animal on the premises. 

Animal and Plant 

Health Inspection 

Service

Veterinary 

Services
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Summary of the Outbreak (Updated information in blue)

The 2019 VSV outbreak began on June 21, 2019, when the National Veterinary Services 

Laboratories (NVSL) in Ames, Iowa confirmed the first VSV-positive (Indiana serotype) 

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, 1,144 VSV-affected premises were identified (472

confirmed positive, 672 suspect). One thousand one hundred twenty-eight (1,128) of these 

premises had only equine species clinically affected, 15 premises had only affected cattle 

(Boulder, Delta, Garfield, Larimer, and Pitkin County, Colorado; Gonzales County, Texas;

Uintah County, Utah; and Hot Springs, Park, and Platte County, Wyoming), and 1 premises 

had both cattle and horses clinically affected (Park County, Wyoming). 

Colorado identified 693 affected premises (275 confirmed positive, 418 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 identified 1 affected premises in 1 county (Sherman County). 

Nebraska identified 26 affected premises (16 confirmed positive, 10 suspect) in 5 counties

(Dawes, Garden, Lincoln, Morrill, and Scotts Bluff Counties). 

New Mexico 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 identified 1 affected premises in 1 county (Tillman County). 

Texas 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 identified 26 affected premises (13 confirmed positive, 13 suspect) in 6 counties 

(Carbon, Duchesne, Emery, Grand, San Juan, and Uintah Counties). 
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Wyoming identified 149 affected premises (43 confirmed positive, 106 suspect) in 11

counties (Albany, Big Horn, Carbon, Converse, Fremont, Goshen, Hot Springs, Laramie, 

Park, Platte, and Sweetwater Counties). 

All (1,144) previously VSV-infected or suspect premises in all affected states have 

completed the quarantine period and been released. All quarantined premises were

released in Oklahoma as of August 7, 2019, New Mexico as of September 5, 2019, Texas 

as of October 31, 2019, Kansas as of November 4, 2019, Nebraska as of November 14, 

2019, Utah as of November 25, 2019, Colorado as of December 17, 2019, and Wyoming 

as of December 27, 2019.

Summary of VSV-Affected Premises

Table 1. Location, number, and status of VSV-affected premises. New information 

in blue.

COLORADO

Confirmed 

Positive 

Premises

Suspect

Premises

Premises 

Released from 

Quarantine

Current 

Premises

Quarantined

 Adams County

 Alamosa County

 Arapahoe County

 Archuleta County

 Boulder County

 Broomfield County

 Chaffee County

 Clear Creek County

 Conejos County

 Delta County

 Dolores County

 Douglas County

 Eagle County

 El Paso County

 Fremont County

 Garfield County

 Gilpin County

 Grand County

 Gunnison County

 Jefferson County

 La Plata County

 Larimer County

 Las Animas County

 Mesa County

 Mineral County

 Moffat County

 Montezuma County

7

2

2

7

24

1

3

1

2

5

1

14

2

1

2

17

1

1

2

36

10

57

1

12

1

1

3

8

2

0

10

35

1

0

0

0

40

0

3

0

0

2

3

0

0

0

28

56

87

0

47

0

0

26

15

4

2

17

59

2

3

1

2

45

1

17

2

1

4

20

1

1

2

64

66

144

1

59

1

1

29

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0
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 Montrose County

 Morgan County

 Ouray County

 Park County

 Pitkin County

 Pueblo County

 Rio Blanco County

 San Miguel County

 Summit County

 Teller County

 Weld County

4232322111

38

25520031410

29

29752353521

67

00000000000

TOTAL: 38 COUNTIES 275 418 693

0

KANSAS

 Sherman County1010

TOTAL: 1 COUNTY

1010

NEBRASKA

 Dawes County

 Garden County

 Lincoln County

 Morrill County

 ScottsBluff County

1112

11

000191113

20

00000

TOTAL: 5 COUNTIES 16 10 26

0

NEW MEXICO

 Cibola County

 Los Alamos County

 Mora County

 Rio Arriba County

 Sandoval County

 San Juan County

 San Miguel County

 Santa Fe County

 Sierra County

 Socorro County

 Taos County

 Valencia County

11117125115

21

0006332600181117

1044

11116

29

000000000000

TOTAL: 12 COUNTIES 47 29 76

0

OKLAHOMA

 Tillman County1010

TOTAL: 1 COUNTY

1010
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TEXAS

Confirmed 

Positive 

Premises

Suspect 

Premises

Premises 

Released from 

Quarantine

Current 

Premises 

Quarantined

 

 Bastrop County

 Bell County

 Bosque County

 Brown County

 Caldwell County

 Coleman County

 Collin County

 Coryell County

 Dallas County

 Eastland County

 Ellis County

 Erath County

 Falls County

 Gonzales County

 Guadalupe County

 Haskell County

 Hays County

 Hill County

 Hood County

 Johnson County

 Kerr County

 Kinney County

 Lampasas County

 Mason County

 McLennan County

 Mills County

 Palo Pinto County

 Parker County

 San Saba County

 Shackelford County

 Somervell County

 Taylor County

 Tom Green County

 Travis County

 Val Verde County

 Wichita County

 Williamson County

9

1

1

1

2

3

3

1

4

1

4

1

1

1

1

1

1

1

4

1

1

1

1

1

2

1

6

4

1

2

2

1

3

2

1

1

4

50

2

0

0

1

0

0

0

0

0

2

1

0

0

5

0

4

0

3

0

0

0

0

0

3

0

1

1

0

0

1

0

0

15

0

0

7

59

3

1

1

3

3

3

1

4

1

6

2

1

1

6

1

5

1

7

1

1

1

1

1

5

1

7

5

1

2

3

1

3

17

1

1

11

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

TOTAL TEXAS: 37 COUNTIES 76 96 172 0

UTAH

Carbon County

Duchesne County

Emery County

Grand County

San Juan County

1

1

1

2

1

0

0

0

1

0

1

1

1

3

1

0

0

0

0

0
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Uintah County 7 12 19 0

TOTAL: 6 COUNTIES 13 13 26 0

WYOMING

 Albany County

 Big Horn County

 Carbon County

 Converse County

 Fremont County

 Goshen County

 Hot Springs County

 Laramie County

 Park County

 Platte County

 Sweetwater County

5

1

3

3

8

1

5

1

10

5

1

1

1

2

6

5

5

11

0

61

14

0

6

2

5

9

13

6

16

1

71

19

1

0

0

0

0

0

0

0

0

0

0

0

TOTAL: 11 COUNTIES 43 106 149 0

TOTAL PREMISES ALL 

STATES

472 672 1144 0

Table 2. Cumulative count of species clinically affected on VSV-positive premises.

State Premises with 

clinically 

affected 

equine species

Premises with 

clinically 

affected 

bovine species

Premises with 

clinical signs 

in both equine 

and bovine 

species 

Premises with 

clinical signs 

in other 

susceptible 

species

Total affected 

premises

COLORADO 688 5 0 0 693

KANSAS 1 0 0 0 1

NEBRASKA 26 0 0 0 26

NEW MEXICO 76 0 0 0 76

OKLAHOMA 1 0 0 0 1

TEXAS 171 1 0 0 172

UTAH 23 3 0 0 26

WYOMING 142 6 1 0 149

TOTAL 1,128 15 1 0 1,144
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Map 1 (Current). Counties with Current VSV-Quarantined Premises

• There are no counties with current VSV-quarantined premises in the U.S. as of 

December 27, 2019. 

Map 2 (Cumulative). Counties with Premises Quarantined for VSV Since June 21, 2019 

(shaded in blue)
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Figure 1. Cumulative Epidemic Curve for Onset of Lesions in Animals on Affected 

Premises in All States. Information complete as of December 5, 2019.

Table 3. Timeline of Events – New Affected Premises

Date Event – New Affect Premises

June 21, 2019 VSV index case for the U.S. confirmed at NVSL – Kinney County, Texas

June 24, 2019 New affected county confirmed – Tom Green County, Texas

June 26, 2019 Index case for New Mexico confirmed – Sandoval County, New Mexico

July 3, 2019 Index case for Colorado confirmed – Weld County, Colorado

July 5, 2019 New affected counties confirmed – Los Alamos, New Mexico; Larimer 

County, Colorado

July 8, 2019 New affected counties confirmed – Valencia County, New Mexico; 

Coleman County, Texas; Kerr County, Texas

July 10, 2019 New affected counties confirmed – La Plata County, Colorado; Santa Fe 

County, New Mexico

July 11, 2019 New affected counties confirmed – Taylor County, Texas; Val Verde 

County, Texas

July 12, 2019 New affected counties confirmed – Boulder County, Colorado; 

Shackelford and Wichita Counties, Texas

July 16, 2019 New affected county confirmed – Broomfield County, Colorado

0

5

10

15

20

25

30

35

40

45

50

6/14/20196/24/2019

7/1/20197/5/20197/8/2019

7/11/20197/14/20197/17/20197/20/20197/23/20197/26/20197/29/2019

8/1/20198/4/20198/7/2019

8/10/20198/13/20198/16/20198/19/20198/22/20198/25/20198/28/20198/31/2019

9/4/20199/7/2019

9/10/20199/13/20199/16/20199/19/20199/22/20199/26/201910/1/201910/7/2019

10/12/201910/16/201910/21/201910/30/201911/12/2019

Reported Premises Affected by Vesicular Stomatitis 

Virus by Date of Onset, 

United States, 6/14/19-12/5/19 

Total
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July 17, 2019 New affected counties confirmed – Adams County, Colorado; Bastrop, 

Hood, and Johnson Counties, Texas

July 18, 2019 New affected county confirmed – Hays County, Texas

July 19, 2019 New affected county confirmed – Delta County, Colorado

July 22, 2019 New affected county confirmed – Archuleta County, Colorado

July 23, 2019 New affected counties confirmed – Montezuma County and Morgan 

County, Colorado; Somervell County, Texas

July 24, 2019 Index case for Wyoming confirmed – Platte County, Wyoming. New 

affected counties confirmed – Mesa County, Colorado; Cibola and San 

Miguel Counties, New Mexico

July 25, 2019 New affected counties confirmed – Brown, Palo Pinto, and Travis 

Counties, Texas

July 26, 2019 New affected counties confirmed – Jefferson County, Colorado; Sierra 

County, New Mexico; Parker County, Texas. 

July 29, 2019 Index case for Oklahoma confirmed – Tillman County, Oklahoma. New 

affected counties confirmed – San Juan County, New Mexico; Caldwell, 

Eastland, and San Saba Counties, Texas. 

July 30, 2019 New affected counties confirmed – Conejos County, Colorado; Mills 

County, Texas. 

July 31, 2019 New affected counties confirmed – Montrose County, Colorado; 

Guadalupe, Lampasas, McLennan, and Williamson Counties, Texas. 

August 1, 2019 New affected counties confirmed – Alamosa and Ouray Counties, 

Colorado; Gonzales and Mason Counties, Texas; Laramie County, 

Wyoming. 

August 2, 2019 New affected counties confirmed – Douglas County, Colorado; Socorro 

County, New Mexico; Falls County, Texas; Converse County, Wyoming. 

August 5, 2019 New affected counties confirmed – Coryell and Erath Counties, Texas.

August 6, 2019 New affected counties confirmed – Gilpin and Pueblo Counties, 

Colorado; Haskell County, Texas. 

August 7, 2019 New affected counties confirmed – Grand County, Colorado; Mora 

County, New Mexico.

August 8, 2019 New affected county confirmed – Bell County, Texas. 

August 9, 2019 Index case for Nebraska confirmed – Lincoln County, Nebraska. New 

affected county confirmed – Bosque County, Texas. 

August 14, 2019 New affected counties confirmed – Arapahoe and Mineral Counties, 

Colorado.

August 15, 2019 New affected counties confirmed – Gunnison County, Colorado; Scotts

Bluff County, Nebraska; Dallas County, Texas; Albany and Sweetwater 

Counties, Wyoming. 

August 16, 2019 New affected county confirmed – Collin County, Texas.

August 19, 2019 Index cases for Utah confirmed – Emery and Uintah Counties, Utah. 

August 20, 2019 New affected counties confirmed – Chaffee and Fremont Counties, 

Colorado.

August 21, 2019 New affected county confirmed – Park County, Colorado

August 22, 2019 New affected counties confirmed – Dawes County, Nebraska; Ellis 

County, Texas; Hot Springs County, Wyoming. 
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August 23, 2019 New affected counties confirmed – Garfield and San Miguel Counties, 

Colorado.

August 26, 2019 New affected counties confirmed – Rio Blanco and Summit Counties, 

Colorado.

August 28, 2019 New affected counties confirmed – El Paso County, Colorado; Grand and 

San Juan Counties, Utah; Carbon and Goshen Counties, Wyoming. 

August 29, 2019 New affected county confirmed – Duchesne County, Utah. 

August 30, 2019 New affected counties confirmed – Dolores County, Colorado; Hill 

County, Texas.

September 3, 2019 New affected counties confirmed – Big Horn and Park Counties, 

Wyoming. 

September 5, 2019 New affected county confirmed – Morrill County, Nebraska. 

September 13, 2019 New affected counties confirmed – Eagle and Las Animas Counties, 

Colorado.

September 17, 2019 New affected county confirmed – Teller County, Colorado

September 19, 2019 New affected county confirmed – Fremont County, Wyoming. 

October 8, 2019 New affected county confirmed – Clear Creek County, Colorado.

October 16, 2019 New affected county confirmed – Moffat County, Colorado.

October 17, 2019 New affected county confirmed – Pitkin County, Colorado.

October 23, 2019 Index case for Kansas confirmed – Sherman County, Kansas. New 

affected county confirmed – Carbon County, Utah. 

October 31, 2019 New affected county confirmed – Garden County, Nebraska.

Table 4. Timeline of Events – State-wide Quarantine Releases

Date Event – Quarantine Release

August 7, 2019 Last VSV quarantine released – Oklahoma.

September 5, 2019 Last VSV quarantine released – New Mexico.

October 31, 2019 Last VSV quarantine released – Texas. 

November 4, 2019 Last VSV quarantine released – Kansas. 

November 14, 2019 Last VSV quarantine released – Nebraska.

November 25, 2019 Last VSV quarantine released – Utah. 

December 17, 2019 Last VSV quarantine released – Colorado. 

December 27, 2019 Last VSV quarantine released – Wyoming.