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 $c{m^3}$ blood.
What describes the immunity of an individual when the values of 1, 2 and 3 are all low ten years after vaccination?
active immunity due to the presence of memory cells
2 )
low immunity due to the absence of antibodies
3 )
low immunity due to the absence of memory cells
4 )
passive immunity due to the presence of antibodies
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