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Discussion

The hepatitis B vaccine contains

  • A.live attenuated hepatitis B virus
  • B.whole virus inactivated with formalin
  • C.antibody harvested from immune donors
  • D.the surface antigen produced by recombinant technology

Answer: D

Yeast cells engineered to make the surface antigen supply the vaccine, so it contains no viral nucleic acid and cannot cause infection. The response it raises is anti-HBs alone, which is why the vaccinated lack core antibody.

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