T-Cell Duplication Delayed Up to 3 Days After Infection

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Whitton and his colleagues "were very much surprised by the discovery that memory cells didn't begin proliferation sooner than their naive counterparts. Memory T-cells are central to the protective immunity of infections and vaccinations, because they act against subsequent encounters with specific microorganisms. Compared to naive cells, memory T-cells can be triggered by lower antigen levels, and their initial response to infection, such as the production of cytokines, is more rapid and more effective."

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The Nemours Foundation has more about the immune system.

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-- Robert Preidt