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
As of September 2017, there were 181 counties in 21 states with reported CWD in free-ranging cervids.
- El Paso
- Rio Blanco
- Jo Daviess
- St. Clair
- Box Butte
- Red Willow
- Scotts Bluff
- Dona Ana
- Fall River
- El Paso
- San Juan
- Big Horn
- Hot Springs
- Page last reviewed: September 25, 2017
- Page last updated: September 25, 2017
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