Fig. 3From: A retrospective study on Xpert MTB/RIF for detection of tuberculosis in a teaching hospital in Chinaa Venn diagram of overlap in TB detection using Xpert MTB/RIF, Acid-fast bacilli (AFB) smear microscopy and Interferon-gamma release assay (IGRA); and b The number of true positive tuberculosis cases detected by the three methods. PTB, pulmonary tuberculosis; EPTB, Extrapulmonary tuberculosis; TP, tuberculous pleurisyBack to article page