That is a long story: The concepts of cell mediated vs antibody mediated immunity developed to explain different reactions. The body uses cell mediated immune mechanisms to fight infections where the infecting agent gets inside the cells. In tuberculosis we use that to help diagnose previous exposure. The TB skin test looks for cells to fight the parts of the TB bacterium that is injected in the skin. (cont.in comment)
Answered 6/11/2017
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