(1) Higher number of IFN-γ producing cells and the levels of cytokines (IFN-γ, IL-2, IL-10, and MIP-1621299821α 621299821) in LTBI vs. TB, and higher ratio of IFN-γ+ CD4+ T cells in LTBI vs. TB or HCs (2) A component of vaccine H56:IC31 and will affect the diagnosis of Rv2660c once the vaccine is available. The gene discussed is CD4; the disease is tuberculosis.