T-helper cells are more numerous against the antigen. Therefore it take a much shorter time for adaptive immunity to be induced on subsequent encounters with the antigen.
Since they are necessary for practically all adaptive immunity,
T-helper cells are perhaps the most significant cells in adaptive immunity. They aid in the activation of cytotoxic T cells, which kill infected target cells, as well as B cells that generate antibodies and macrophages that kill ingested microorganisms.
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