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The average incubation period of hepatitis A is about

  • A.about 6 months
  • B.28 days
  • C.about 7 days
  • D.about 90 days

Answer: B

Correct answer: 28 days

Hepatitis A incubates for about a month, with a usual range of two to six weeks. That is long enough for an infected food handler to expose a great many people before anyone falls ill, which is why outbreak investigation has to look back several weeks and why post-exposure vaccination is still worth giving.

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