@feha @Chizan
Generally, eating anything that died with a disease is not advisable. Most of the meat we eat are from slaughtered healthy livestock.
The problem isn't exactly because of cannibalism. Prions in nature could be spread through remains/manure on the ground. As for the Mad Cow Disease, remains of
infected cattle (which could have acquired it from prions in the environment) were fed to live cattle as bonemeal, and then these infected living cattle might be slaughtered for meat at some point which would be how it could spread to humans. Kuru on the other hand is an unfortunate consequence of a funeral practice of eating the remains of someone who has just died, usually by Kuru itself. I bet a cannibalistic tribe who exclusively ate healthy people would have probably been fine.