One way this can happen is when people eat beef from cows that have bovine spongiform encephalopathy, better known as "mad cow disease." The U.S. has had strict regulations in place since the ...

An autoimmune disease is the result of the immune system mistakenly attacking the body’s healthy tissues. Typically, this is different from other types of immune responses, such as an allergic ...

They are sometimes spread to humans by infected meat products. In many cases, the source of the abnormal protein is unknown. The most common form of prion disease that affects humans is ...