Fig. 1

Smear-negative TB patients have higher percentage of CD27−IFN-γ+ cells in their peripheral blood. a-d The percentage of CD27 in CD4 T cells population. e-h The percentage of “CD27−IFN-γ+CD4+” cells population by a flow cytometry. i ROC-curve of “CD27−IFN-γ+CD4+” percentages for discriminating SN-TB patients from HC or (and) TB-C. j The percentage of “CD27−IFN-γ+CD4+” cells population in recent and chronic SN-TB patients. ***P < 0.0001