Below is an instruction from Human. Write a response.
    ### Instruction:
    What is the outlook for Subacute Sclerosing Panencephalitis ?
    ### Response:
    Most individuals with SSPE will die within 1 to 3 years of diagnosis. In a small percentage of people, the disease will progress rapidly, leading to death over a short course within three months of diagnosis. Another small group will have a chronic, slowly progressive form, some with relapses and remissions.
    