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During the course of an infection, the pathogen invades the
body and its antigen is recognized either by the antibody
binding sits of a B-lymphocyte or the binding sites of a
T-lymphocyte cell surface membrane.
Once activated, the immune system produces clones of
B-lymphocytes and T-lymphocytes by mitosis which
differentiate…

Page 2

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occurs naturally during the course of an infection so we can
call it natural active immunity.
We can activate the body's T and B cells by introducing small
quantities of antigen either by injection or orally (e.g via
sugar lump!). The antigens are treated before being
introduced to the body…

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