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The proportion of infants infected with hepatitis B at birth who become chronically infected is about

  • A.under 1 per cent
  • B.90 per cent
  • C.about 30 per cent
  • D.about 5 per cent

Answer: B

An immature immune system fails to clear the virus, so about nine in ten infected newborns become chronic carriers, compared with about 30 per cent of children infected between one and five years. That gradient is precisely why vaccination begins at birth.

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