Biology / Bio 3287 · Atom · ~20 seconds
Immunological Memory
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Memory B and T cells, generated during clonal selection, per Bio 3277, persist long after infection clears, allowing a faster, stronger response if the antigen reappears.
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A second exposure typically produces milder symptoms, or none, compared with the first.
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Memory is antigen-specific — memory against one pathogen gives no protection against an unrelated one.