Creutzfeldt-Jakob disease (CJD) is a rare and fatal condition that affects the brain. CJD causes brain damage that becomes worse over time. Most people with CJD die from an infection within a year of the initial symptoms - often because the immobility caused by CJD can make people with the condition vulnerable. There is no proven cure for any type of CJD, although clinical trials are investigating possible treatments. Treatment involves keeping the patient as comfortable as possible and reducing symptoms through medicine use.