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Distribution of TB antigen-specific IFN-γ secreting T cells in response to TB antigens in the QFT-Plus and TB-Feron assays measured using flow cytometry intracellular cytokine analysis. (A) CD4+ T cells (B) CD8+ T cells; Abbreviation: TB, tuberculosis; IFN-γ, interferon-gamma; QTB1, QFT-Plus TB1 tube, QFT2, QFT-Plus TB2 tube.
