CWD is a fatal nervous system disease found in members of the deer family (cervids). The disease is much more common in deer, but is also found in moose and elk. CWD belongs to a group of diseases known as Transmissible Spongiform Encephalopathies (TSEs). This includes:
CWD occurs in some parts of eastern Alberta, from Cold Lake south to the US border. It has also been found in wild game (cervids) in Saskatchewan, 25 states in the United States, Norway, and South Korea.
There is no direct evidence that CWD has ever been transmitted to humans like mad cow disease (as CJD). However, some research shows that CWD can be transmitted to primates closely related to humans by feeding them meat or brain tissue from deer and elk infected with CWD. As a result, health organizations, such as the Centers for Disease Control and Prevention, advise caution when eating meat from animals harvested from areas where CWD has been found.
TSEs like chronic wasting disease and mad cow disease are caused by infectious proteins called prions (say “PREE-ons”). In CWD, these proteins are found in the brain, spinal cord, lymph nodes, spleen, and muscle tissue.
CWD disease is thought to be spread between animals by direct animal to animal contact, contact with saliva, urine, carcass parts, or feces from infected animals, and can even spread through soil that has been contaminated with any of the above tissues or fluids.
Alberta Health recommends that any animals from the deer family harvested from areas where CWD has been
found should be tested before any parts of the animal are eaten. A negative test result does not guarantee that the animal is not infected with the disease, but does make it less likely. A number of health organizations continue to gather evidence and evaluate any potential human health risk of CWD.
Additional precautions include:
Please note: restaurants that sell venison or other game meat get their meat from a farm. All of these animals are tested and must be shown to be negative for CWD before being sold. The risk of coming into contact with infected meat is therefore considered to be insignificant in these settings.
The following health organizations are tracking and studying CWD. Their websites have the most up-to-date information about this disease.
Current as of: December 11, 2018
Author: Alberta Health
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