Memory T cells are a specific type of
infection-fighting
T cell (also known as a
T lymphocyte) that can recognize foreign invaders such as
bacteria or
viruses, that were encountered during a prior infection or
vaccination. At a second encounter with the invader, memory T cells can reproduce to mount a faster and stronger
immune response than the first time the immune system responded to the invader. This behaviour is utilized in T lymphocyte proliferation assays, which can reveal exposure to specific antigens.
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