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Active immunity is not acquired by

  • A.infection
  • B.vaccination
  • C.immunoglobulin transfer
  • D.subclinical infection

Answer: C

Correct answer: immunoglobulin transfer

Receiving ready-made immunoglobulin gives passive immunity: the recipient’s own immune system never responds, so no memory is left and the protection fades within weeks. Active immunity is what the body builds for itself - after an infection, a subclinical infection, or a vaccination.

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