Definition of slow virus
: any of various infectious agents now usually considered to be prions that have a long incubation period between infection and the clinical appearance of the associated disease
compare prion disease
Medical Definition of slow virus
: any of various viruses or prions having a long incubation period between infection and the clinical appearance of the slowly progressive serious or fatal disease (as scrapie or Creutzfeldt-Jakob disease) associated with it
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