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The average incubation period of hepatitis B to the onset of symptoms is about

  • A.about 10 days
  • B.about 28 days
  • C.about two years
  • D.90 days

Answer: D

Symptoms appear on average about 90 days after exposure, with a range of 60 to 150 days, and abnormal liver enzymes somewhat earlier at around 60 days. The long and variable interval often makes the source of infection impossible to identify.

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