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Creutzfeldt-Jakob (KROITS-felt YAH-kobe) disease (CJD) is a degenerative brain disorder that leads to dementia and, ultimately, death. Creutzfeldt-Jakob disease symptoms can be similar to those of other dementia-like brain disorders, such as Alzheimer's disease. But Creutzfeldt-Jakob disease usually progresses much more rapidly. It affects about one person in every one million per year worldwi...