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Occurrence

As of August 1 2018, CWD in free-ranging deer, elk and/or moose has been reported in at least 23 states in the continental United States, as well as two provinces in Canada. The disease has also been found in farmed deer, elk, and reindeer. In addition, CWD has been reported in Norway (reindeer, moose, red deer) and Finland (moose), and a small number of imported cases have been reported in South Korea.

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 23 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, August 1, 2018

Chronic Wasting Disease Among Free-Ranging Cervids by County, United States, August 1, 2018

As of August 1, 2018, there were 226 counties in 23 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. Madison
  5. Marion
  6. Newton
  7. Pope
  8. Searcy
  9. Sebastian
  10. 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. Moffatt
  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. Wayne

Kansas

  1. Cheyenne
  2. Decatur
  3. Ellis
  4. Finney
  5. Ford
  6. Graham
  7. Gray
  8. Grove
  9. Hodgeman
  10. Jewell
  11. Kearny
  12. Logan
  13. Meade
  14. Ness
  15. Norton
  16. Pawnee
  17. Phillips
  18. Rawlins
  19. Rush
  20. Scott
  21. Sheridan
  22. Sherman
  23. Smith
  24. Stafford
  25. Thomas
  26. Trego
  27. Wallace

Maryland

  1. Allegany

Michigan

  1. Clinton
  2. Ingham
  3. Ionia
  4. Jackson
  5. Kent
  6. Montcalm

Minnesota

  1. Fillmore
  2. Olmsted

Mississipi

  1. Issaquena

Missouri

  1. Adair
  2. Cedar
  3. Cole
  4. Franklin
  5. Jefferson
  6. Linn
  7. Macon
  8. Perry
  9. Polk
  10. St. Clair
  11. Ste. Genevieve

Montana

  1. Liberty
  2. Carbon

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. Lincoln
  28. Lancaster
  29. Loup
  30. Morrill
  31. Nance
  32. Phelps
  33. Polk
  34. Red Willow
  35. Saline
  36. Scotts Bluff
  37. Sheridan
  38. Sioux
  39. Thayer
  40. 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. Carbon
  2. Daggett
  3. Grand
  4. San Juan
  5. Sanpete
  6. Uintah
  7. Utah

Virginia

  1. Frederick
  2. Shenandoah

West Virginia

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

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. Milwaukee
  16. Oneida
  17. Portage
  18. Racine
  19. Richland
  20. Rock
  21. Sauk
  22. Vernon
  23. Walworth
  24. Washburn
  25. Waukesha

Wyoming

  1. Albany
  2. Big Horn
  3. Campbell
  4. Carbon
  5. Converse
  6. Crook
  7. Freemont
  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. Washakie
  21. Weston
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