Cell-Mediated Immunity (Cmi):
This branch of the immune system exists primarily to deal with viruses, which are more insidious than bacteria because they invade the host (e.g., human) cells, where they can hide from the antibody-making cells of the immune system. With this system, the reaction to foreign material is performed by specific defense cells, such as killer T cells, macrophages, and other white blood cells rather than by antibodies.
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