Discussion
A person is injected with gammaglobulin against hepatitis B. It is
Answer: A
Correct answer: Artificially acquired passive immunity
Gammaglobulin is a preparation of ready-made antibodies, so the recipient’s own immune system is bypassed entirely: the immunity is passive, and because it was injected rather than received across a placenta it is artificially acquired. It works at once, which is why it is used after a suspected exposure, but it fades within weeks and leaves no memory.
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