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(A) Receiver operating characteristic curves showing the performance of QuantiFERON-TB Gold Plus for predicting incident tuberculosis during the duration of follow-up, stratified by antigen tube interferon-γ responses. TB max = higher of the CD4+-response tube (TB1) and CD8+-response tube (TB2). AUC = area under the curve (95% confidence interval). (B) Scatterplot showing association of interferon-γ responses in the TB1 and TB2 tubes.
