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Occurrence

By the mid-1990s, CWD had been diagnosed among free-ranging deer and elk in a contiguous area in northeastern Colorado and southeastern Wyoming, where the disease is now endemic. In recent years, CWD has been found in areas outside of this disease-endemic zone, including areas east of the Mississippi River. The geographic range of diseased animals currently includes 21 U.S. states and two Canadian provinces and is likely to continue to grow. Surveillance studies of hunter-harvested animals indicate the overall prevalence of the disease in northeastern Colorado and southeastern Wyoming from 1996 to 1999 was approximately 5% in mule deer, 2% in white-tailed deer, and <1% in elk.

Chronic Wasting Disease Among Free-Ranging Cervids by County, United States, October 2016

Chronic Wasting Disease Among Free-Ranging Cervids by County, United States, November 2016

As of October, 2016, there were 164 counties in 21 states with reported CWD in free-ranging cervids.

State County
Arkansas 1. Boone
2. Carroll
3. Madison
4. Newton
5. Pope
Colorado 1. Boulder
2. Douglas
3. Eagle
4. El Paso
5. Grand
6. Jackson
7. Jefferson
8. Larimer
9. Logan
10. Mesa
11. Moffatt
12. Morgan
13. Phillips
14. Pueblo
15. Rio Blanco
16. Routt
17. Sedgwick
18. Summit
19. Weld
20. Yuma
Illinois 1. Boone
2. Dekalb
3. DuPage
4. Grundy
5. Jo Daviess
6. Kane
7. Kankakee
8. Kendall
9. Lake
10. LaSalle
11. Livingston
12. McHenry
13. Ogle
14. Stephenson
15. Will
16. Winnebago
Iowa 1. Allamakee
Kansas 1. Cheyenne
2. Decatur
3. Ellis
4. Ford
5. Graham
6. Gray
7. Grove
8. Hodgeman
9. Jewell
10. Kearny
11. Logan
12. Meade
13. Norton
14. Pawnee
15. Phillips
16. Rawlins
17. Scott
18. Sheridan
19. Sherman
20. Smith
21. Stafford
22. Thomas
23. Trego
24. Wallace
Maryland 1. Allegany
Michigan 1. Clinton
2. Ingham
Minnesota 1. Olmsted
Missouri

1. Adair
2. Cole
3. Franklin
4. Linn
5. Macon

Nebraska 1. Arthur
2. Banner
3. Boone
4. Box Butte
5. Buffalo
6. Cherry
7. Cheyenne
8. Custer
9. Dawes
10. Deuel
11. Furnas
12. Garden
13. Grant
14. Hall
15. Harlan
16. Hitchcock
17. Holt
18. Hooker
19. Keith
20. Kimball
21. Lincoln
22. Loup
23. Morrill
24. Nance
25. Phelps
26. Red Willow
27. Scotts Bluff
28. Sheridan
29. Sioux
30. Webster
New Mexico 1. Dona Ana
2. Otero
3. Socorro
New York 1. Oneida
North Dakota 1. Grant
2. Sioux
Pennsylvania 1. Blair
2. Bedford
South Dakota 1. Custer
2. Fall River
3. Lawrence
4. Pennington
Texas 1. El Paso
2. Hartley
3. Hudspeth
Utah 1. Daggett
2. Grand
3. San Juan
4. Sanpete
5. Uintah
6. Utah
Virginia 1. Frederick
2. Shenandoah
West Virginia 1. Hampshire
2. Hardy
Wisconsin 1. Adams
2. Columbia
3. Dane
4. Grant
5. Green
6. Iowa
7. Jefferson
8. Juneau
9. Kenosha
10. Lafayette
11. Portage
12. Racine
13. Richland
14. Rock
15. Sauk
16. Walworth
17. Washburn
18. Waukesha
Wyoming 1. Albany
2. Big Horn
3. Carbon
4. Converse
5. Crook
6. Goshen
7. Hot Springs
8. Johnson
9. Laramie
10. Lincoln
11. Natrona
12. Niobrara
13. Platte
14. Sheridan
15. Washakie
16. Weston
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