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Occurrence

As of September 2017, CWD in free-ranging deer, elk and/or moose has been reported in at least 21 states in the continental United States, as well as two provinces in Canada. In addition, CWD has been reported in reindeer and moose in Norway, and a small number of imported cases have been reported in South Korea. The disease has also been found in farmed deer and elk.

CWD was first identified in captive deer in the late 1960s in Colorado and in wild deer in 1981. By the 1990s, it had been reported in surrounding areas in northern Colorado and southern Wyoming. Since 2000, the area known to be affected by CWD in free-ranging animals has increased to at least 21 states, including states in the Midwest, Southwest, and limited areas on the East Coast. It is possible that CWD may also occur in other states without strong animal surveillance systems, but that cases haven’t been detected yet. Once CWD is established in an area, the risk can remain for a long time in the environment. The affected areas are likely to continue to expand.

Nationwide, the overall occurrence of CWD in free-ranging deer and elk is relatively low. However, in several locations where the disease is established, infection rates may exceed 10 percent (1 in 10), and localized infection rates of more than 25 percent (1 in 4) have been reported. The infection rates among some captive deer can be much higher, with a rate of 79% (nearly 4 in 5) reported from at least one captive herd.

Chronic Wasting Disease Among Free-Ranging Cervids by County,United States, September 2017

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

As of September 2017, there were 181 counties in 21 states with reported CWD in free-ranging cervids.

Arkansas

  1. Boone
  2. Carroll
  3. Madison
  4. Marion
  5. Newton
  6. Pope
  7. Searcy

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
  2. Clayton

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. Fillmore
  2. Olmsted

Missouri

  1. Adair
  2. Cole
  3. Franklin
  4. Jefferson
  5. Linn
  6. Macon
  7. St. Clair

Nebraska

  1. Arthur
  2. Banner
  3. Boone
  4. Box Butte
  5. Buffalo
  6. Cass
  7. Cherry
  8. Cheyenne
  9. Custer
  10. Dawes
  11. Deuel
  12. Furnas
  13. Garden
  14. Grant
  15. Hall
  16. Harlan
  17. Hitchcock
  18. Holt
  19. Hooker
  20. Keith
  21. Kimball
  22. Lincoln
  23. Lancaster
  24. Loup
  25. Morrill
  26. Nance
  27. Phelps
  28. Polk
  29. Red Willow
  30. Saline
  31. Scotts Bluff
  32. Sheridan
  33. Sioux
  34. Thayer
  35. 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
  3. Cambria
  4. Clearfield
  5. Fulton

South Dakota

  1. Custer
  2. Fall River
  3. Lawrence
  4. Pennington

Texas

  1. Dallam
  2. El Paso
  3. Hartley
  4. Hudspeth
  5. Medina

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. Crawford
  3. Columbia
  4. Dane
  5. Grant
  6. Green
  7. Iowa
  8. Jefferson
  9. Juneau
  10. Kenosha
  11. Lafayette
  12. Portage
  13. Racine
  14. Richland
  15. Rock
  16. Sauk
  17. Walworth
  18. Washburn
  19. 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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