Biology 9700 · AS & A Level · Antibodies and vaccination

Antibodies and vaccination — practice question

Influenza is a contagious disease caused by a virus. A person can catch influenza more than once. Which statements give the reasons why influenza can be caught more than once?

  • A1, 2 and 3
  • B1 and 2 only
  • C1 and 3 only
  • D2 and 3 only

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