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    A person was infected with a pathogen and then later in life they were re-infected with the same pathogen. The graph shows the concentration of antibodies found in the blood that were produced in response to these two infections.

    Question
    SLPaper 1A

    A person was infected with a pathogen and then later in life they were re-infected with the same pathogen. The graph shows the concentration of antibodies found in the blood that were produced in response to these two infections.

    Time / days

    What is the reason for the faster rise in antibody concentration after the second infection?

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