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Discussion

The proportion of adults infected with hepatitis B who recover completely is about

  • A.about 25 per cent
  • B.under 10 per cent
  • C.95 per cent
  • D.about 50 per cent

Answer: C

Most adults mount an effective response and clear the virus, leaving lifelong immunity, so chronic infection in an adult is the exception. The risk of chronicity runs in the opposite direction to age, being highest in the newborn.

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