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Discussion

The presence of hepatitis B surface antigen in serum indicates

  • A.current infection, whether acute or chronic
  • B.immunity acquired through vaccination
  • C.recovery from an infection in the distant past
  • D.immunity acquired from a natural infection

Answer: A

The surface antigen is a viral product, so finding it means virus is present; whether the infection is acute or chronic is settled by other markers and by how long it persists. Antigen lasting beyond six months defines chronic infection.

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