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Live vaccines contain

  • A.attenuated bacteria
  • B.immunogenic component of the bacteria
  • C.inactivated bacteria
  • D.inactivated toxin

Answer: A

Correct answer: attenuated bacteria

A live vaccine contains organisms that have been attenuated - weakened by repeated passage or by mutation so that they multiply in the recipient without causing disease. Because they multiply, the dose is small and the immunity strong and long-lasting; the price is that they must be kept cold and are unsafe for the immunocompromised. BCG and oral polio are examples.

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