A-LevelBiologyImmunity9700/12 · May/June 2023 · Q401 Mark
A successful vaccination programme provides a level of immunity where the majority of a population is protected. There are several factors that can affect the success of a vaccination programme. Which row correctly shows the factors that can affect the success of a vaccination programme?
Afrequent mutation of the pathogen (affects), vaccination from eight weeks old (affects), pathogen is able to invade T-cells (not affects), booster vaccinations needed frequently (affects)
Bfrequent mutation of the pathogen (affects), vaccination from eight weeks old (affects), pathogen is able to invade T-cells (affects), booster vaccinations needed frequently (not affects)
Cfrequent mutation of the pathogen (not affects), vaccination from eight weeks old (affects), pathogen is able to invade T-cells (not affects), booster vaccinations needed frequently (affects)
Dfrequent mutation of the pathogen (affects), vaccination from eight weeks old (not affects), pathogen is able to invade T-cells (affects), booster vaccinations needed frequently (not affects)
✓ Correct answer
B: frequent mutation of the pathogen (affects), vaccination from eight weeks old (affects), pathogen is able to invade T-cells (affects), booster vaccinations needed frequently (not affects)
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