CAIE A Level Biology 9700 · Immunity

Immunity: outline question

Outline4 marksStandard

A new vaccine has been developed against Pneumovirus X, a respiratory virus. The vaccine contains inactivated viral antigens. Following a course of injections, vaccinated individuals show strong protection against Pneumovirus X for many years. Outline the immunological mechanisms that explain how a vaccine provides long-term immunity.

How this question is marked

4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.

Outline means: Give the main points briefly. Less detail than describe, but every key step has to be there. One short line per step, in order. The marks are for coverage, not depth.

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