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What is not required in the innate immune responses?

  • A.antigen
  • B.strong immunity
  • C.pathogen
  • D.previous contact

Answer: D

Correct answer: previous contact

Innate immunity acts on the first encounter, because it recognises broad patterns shared by whole classes of microbe rather than one particular antigen. No previous contact is needed - and that is precisely what distinguishes it from acquired immunity, which must be primed before it can act.

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