Chronic Wasting Disease in Washington
Chronic Wasting Disease (CWD) is a lethal neurodegenerative disease affecting wild cervids (e.g., deer, moose, elk, caribou) in North America and Scandinavia. In the US, CWD has been detected in 35 states, and this August, the Washington Department of Fish and Wildlife (WDFW) announced the first detection of CWD in our home state, Washington. CWD is caused by infectious misfolded proteins called prions that aggregate in tissues throughout an animal’s body. Prions are predominantly found in lymph and nervous system tissues, including the brain. These prion clusters (amyloids) essentially "swiss-cheese" the brain, causing the neurodegenerative symptoms indicative of this wasting disease. These clinical signs of disease appear in the last 6-8 weeks of a cervid’s life and include symptoms such as weight loss, lethargy, a splay-legged stance, drooping ears, and loss of fear. Chronic wasting disease affects cervid species common to Washington, such as mule deer, pictured here.