A prion is a type of protein that can trigger normal proteins in the brain to fold abnormally.

Prion diseases spread to humans by infected meat products.

The most common form of prion disease that affects humans is Creutzfeldt-Jakob disease (CJD).

Prion diseases are rare. About 300 cases are reported each year in the U.S.

Types of prion diseases include:

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Update November 12, 2020