The graph shows the antibody concentration in blood following vaccination and a booster vaccination 28 days later.
Which statements about the changes in antibody concentration are correct?
1 Antibody concentration falls after the primary response because antibodies are broken down and are no longer being produced.
2 The secondary response is more rapid due to memory B cells produced from activated B cells in the primary response.
3 The secondary response lasts longer than the primary response because memory B cells live longer than plasma B cells.
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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