Prions

Scientists Find Evidence That Sheep Can Cause Mad Cow Disease

Scientists Find Evidence That Sheep Can Cause Mad Cow Disease

Researchers think they’ve solved one of the most enduring mysteries of a strange, always-fatal disease that turns both people and cows mad. In experiments with genetically manipulated mice, they found direct evidence that mad cow disease—a condition caused by a zombie-like, brain-destroying protein called a prion—can be caused by contact…