Occurrence

As of June 7, 2019, CWD in free-ranging deer, elk and/or moose has been reported in at least 24 states in the continental United States, as well as two provinces in Canada. In addition, CWD has been reported in reindeer and/or moose in Norway, Finland, and Sweden, 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 a Colorado research facility in the late 1960s, 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 24 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

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

As of June 7, 2019, there were 274 counties in 24 states with reported CWD in free-ranging cervids. This map is based on the best-available information from multiple sources, including state wildlife agencies and the United States Geological Survey (USGS).

Arkansas

  1. Boone
  2. Benton
  3. Carroll
  4. Johnson
  5. Madison
  6. Marion
  7. Newton
  8. Pope
  9. Searcy
  10. Sebastian
  11. Scott
  12. Washington

Colorado

  1. Adams
  2. Boulder
  3. Delta
  4. Douglas
  5. Eagle
  6. El Paso
  7. Garfield
  8. Grand
  9. Jackson
  10. Jefferson
  11. Larimer
  12. Kit Carson
  13. Logan
  14. Mesa
  15. Moffat
  16. Montrose
  17. Morgan
  18. Park
  19. Phillips
  20. Pueblo
  21. Rio Blanco
  22. Routt
  23. Sedgwick
  24. Summit
  25. Weld
  26. Yuma
  27. Washington

Illinois

  1. Boone
  2. Carroll
  3. Dekalb
  4. DuPage
  5. Grundy
  6. Jo Daviess
  7. Kane
  8. Kankakee
  9. Kendall
  10. Lake
  11. LaSalle
  12. Livingston
  13. McHenry
  14. Ogle
  15. Stephenson
  16. Will
  17. Winnebago

Iowa

  1. Allamakee
  2. Clayton
  3. Dubuque
  4. Wayne

Kansas

  1. Cheyenne
  2. Decatur
  3. Edwards
  4. Ellis
  5. Finney
  6. Ford
  7. Graham
  8. Gray
  9. Grove
  10. Hamilton
  11. Haskell
  12. Hodgeman
  13. Jewell
  14. Kearny
  15. Lane
  16. Logan
  17. Meade
  18. Ness
  19. Norton
  20. Osborne
  21. Pawnee
  22. Pratt
  23. Phillips
  24. Rawlins
  25. Reno
  26. Rooks
  27. Rush
  28. Scott
  29. Sheridan
  30. Sherman
  31. Smith
  32. Stafford
  33. Thomas
  34. Trego
  35. Wallace

Maryland

  1. Allegany

Michigan

  1. Clinton
  2. Dickinson
  3. Eaton
  4. Gratiot
  5. Ingham
  6. Ionia
  7. Jackson
  8. Kent
  9. Montcalm

Minnesota

  1. Crow Wing
  2. Fillmore
  3. Houston
  4. Olmsted
  5. Winona

Mississipi

  1. Benton
  2. Issaquena
  3. Marshall
  4. Panola
  5. Pontotoc
  6. Tallahatchie

Missouri

  1. Adair
  2. Cedar
  3. Cole
  4. Crawford
  5. Franklin
  6. Jefferson
  7. Linn
  8. Macon
  9. Mercer
  10. Oregon
  11. Perry
  12. Polk
  13. St. Clair
  14. Ste. Genevieve
  15. Stone
  16. Taney

Montana

  1. Blaine
  2. Carbon
  3. Daniels
  4. Hill
  5. Liberty
  6. Lincoln
  7. Phillips
  8. Sheridan
  9. Valley

Nebraska

  1. Arthur
  2. Banner
  3. Boone
  4. Box Butte
  5. Buffalo
  6. Cass
  7. Chase
  8. Cherry
  9. Cheyenne
  10. Custer
  11. Dawes
  12. Deuel
  13. Dundy
  14. Franklin
  15. Frontier
  16. Furnas
  17. Garden
  18. Grant
  19. Hall
  20. Harlan
  21. Hayes
  22. Hitchcock
  23. Holt
  24. Hooker
  25. Keith
  26. Kimball
  27. Keya Paha
  28. Lincoln
  29. Lancaster
  30. Loup
  31. Morrill
  32. Nance
  33. Phelps
  34. Polk
  35. Red Willow
  36. Saline
  37. Scotts Bluff
  38. Sheridan
  39. Sioux
  40. Thayer
  41. Valley
  42. Webster

New Mexico

  1. Dona Ana
  2. Otero
  3. Socorro

New York

  1. Oneida

North Dakota

  1. Grant
  2. Divide
  3. Sioux
  4. Williams

Pennsylvania

  1. Blair
  2. Bedford
  3. Cambria
  4. Clearfield
  5. Franklin
  6. Fulton
  7. Huntingdon
  8. Jefferson

South Dakota

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

Tennessee

  1. Fayette County
  2. Hardeman County
  3. Madison

Texas

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

Utah

  1. Carbon
  2. Daggett
  3. Grand
  4. San Juan
  5. Sanpete
  6. Uintah
  7. Utah

Virginia

  1. Culpepper
  2. Frederick
  3. Shenandoah

West Virginia

  1. Berkeley
  2. Hampshire
  3. Hardy
  4. Mineral
  5. Morgan

Wisconsin

  1. Adams
  2. Crawford
  3. Columbia
  4. Dane
  5. Dodge
  6. Eau Claire
  7. Grant
  8. Green
  9. Iowa
  10. Jefferson
  11. Juneau
  12. Kenosha
  13. Lafayette
  14. Lincoln
  15. Marquette
  16. Milwaukee
  17. Oneida
  18. Portage
  19. Racine
  20. Richland
  21. Rock
  22. Sauk
  23. Vernon
  24. Walworth
  25. Washburn
  26. Waukesha

Wyoming

  1. Albany
  2. Big Horn
  3. Campbell
  4. Carbon
  5. Converse
  6. Crook
  7. Fremont
  8. Goshen
  9. Hot Springs
  10. Johnson
  11. Laramie
  12. Lincoln
  13. Natrona
  14. Niobrara
  15. Park
  16. Platte
  17. Sheridan
  18. Sublette
  19. Sweetwater
  20. Teton
  21. Washakie
  22. Weston