A-LevelBiologyInfectious diseases9700/12 · Oct/Nov 2018 · Q401 Mark
Why has it proved difficult to develop an effective vaccine against malaria?
AMosquitoes have many stages in their life cycles.
BThe human immune system does not recognise the antigens of the parasite.
CThe parasites can only be attacked when outside the liver cells and red blood cells.
DVaccines are rapidly broken down by proteases in the stomach.
✓ Correct answer
C: The parasites can only be attacked when outside the liver cells and red blood cells.
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