Mad Cow disease still exists and still infects humans. Millions of cows were killed, and hundreds of people died because of the Prion disease Mad Cow. There is no cure or,, treatment, or vaccination. Misfolded Prions Cattle but not pigs. Cats but not dogs. Sheep but not goats. Squirrels but not rabbits. Prions cannot be killed because they are not alive. Prions can be destroyed at temperatures above 700 degrees F. Autoclaving does not destroy Prions. Prions thrive on stainless and mild steel. The dormancy period for Prion Disease can be as much as 50 years