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Biology...just the basics
Here in Pennsylvania we had been able to avoid this disease until just recently:

CWD - is thought to be a transmissible spongiform encephalopathy
        - is a prion (rogue protein (discovered in 1978))
        - is a disease of mule and whitetail deer, elk and moose (cervids)
        - discovered in 1967 (mule deer - Colorado)
        - as the name suggests the diseased animals have chronic                         weight loss and die (always fatal)
        - transfer is thought to be direct animal-to-animal contact or                     environment-to-animal exposure
        - has not been found to be a threat to humans, livestock or                         domestic pets - that being said humans should not eat the                 meat of sick or CWD positive animals

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