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How do we know that sporadic Creutzfeldt-Jakob disease (supposedly 85% of cases) is spontaneous in origin? Might some or even most cases of sporadic CJD actually be acquired cases in which an unknown source of prion-containing food was consumed?

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How do we know that sporadic Creutzfeldt-Jakob disease (supposedly 85% of cases) is spontaneous in origin? Might some or even most cases of sporadic CJD actually be acquired cases in which an unknown source of prion-containing food was consumed?	1