Immune memory is a feature of the adaptive immune response. After B or T cells are activated, they expand rapidly. As the problem resolves, cells stop dividing and are retained in the body as memory cells. The next time this same pathogen enters the body, a memory cell is already poised to react and can clear away the pathogen before it establishes itself.
Source: NIAID (NIH)1
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- Source: NIAID (NIH): niaid.nih.gov/ topics/ immunesystem/ Pages/ features.aspx)
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