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The hepatitis B vaccine cannot cause infection because it contains

  • A.only killed whole virus
  • B.live virus of reduced virulence
  • C.antibody rather than antigen
  • D.no viral nucleic acid

Answer: D

A single recombinant protein has no genome, so there is nothing to replicate and no possibility of infection even in an immunocompromised recipient. That is a further advantage over inactivated whole virus preparations.

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