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Vaccines are made up of:

  • A.Chemicals
  • B.Weak microorganisms
  • C.Viruses
  • D.Drugs

Answer: B

Correct answer: Weak microorganisms

A vaccine contains the pathogen in a form that cannot cause disease - weakened (attenuated) or killed organisms, or just a part of one such as a surface protein or an inactivated toxin. The immune system responds and retains memory cells, so a later encounter with the real organism is dealt with at once.

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