Creutzfeldt-Jakob disease (CJD) is a rare, degenerative brain disorder related to mad cow disease. Symptoms usually start around age 60. Memory problems, behavior changes, vision problems and poor muscle coordination progress quickly to dementia, coma and death. Most patients die within a year, the National Institutes of Health reported on its Web site. There is no known way to prevent CJD and there is no effective treatment either.

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