CD4 and tuberculosis: Figure 1A shows the gating strategy used to select CD4+ T cells and comprise of sequential gating, dump channel (excluding dead cells, CD19 and CD14 cells) vs CD3+, single live cells, and CD4+vs IFN-γ+cells, and Figure 1B shows cumulative data of the phenotype distribution of IFN-γ-producing CD4+ T cells from 18 patients with active TB disease.