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A live attenuated viral vaccine differs from an inactivated one in that it

  • A.contains no viral antigens
  • B.can confer lifelong immunity after one series
  • C.cannot cause infection under any circumstances
  • D.always requires several booster doses

Answer: B

Because the virus replicates in the recipient, one course often gives immunity that lasts for life. The cost of that advantage is the possibility of reversion to a pathogenic form, which is why such vaccines need extensive testing.

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