... during the past several years to be a key effector cytokine in the host response against tuberculosis. Th2 cells primarilysecrete the cytokines interleukin-4, interleukin-5, and inter-leukin-10, ... evi-dence for the importance and potential clinical utility of thiscytokine in vaccine development, or perhaps as adjunctiveimmunotherapy.CD8+T lymphocytesDuring the past 3–4 years, increasing attention ... Tc1phenotype, similar to a Th1 phenotype, is the predominanttype of CD8+cell; in addition, they are cytotoxic T cellsand probably play a significant role in true protectiveimmunity of the type...