A-LevelBiologyImmunity9700/12 · Oct/Nov 2019 · Q381 Mark
Immune response to a vaccination against a virus can be assessed by making three measurements: 1 the concentration of anti-virus antibody in the blood 2 the time taken to increase the antibody concentration significantly after a booster vaccination 3 the number of virus-specific lymphocytes per cm³ blood. What describes the immunity of an individual when the values of 1, 2 and 3 are all low ten years after vaccination?
Aactive immunity due to the presence of memory cells
Blow immunity due to the absence of antibodies
Clow immunity due to the absence of memory cells
Dpassive immunity due to the presence of antibodies
✓ Correct answer
A: active immunity due to the presence of memory cells
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