Table 1.

Xpert MTB/RIF versus AFB smear microscopy and culture results for 79 clinical specimens^a

Xpert MTB/RIF result	Microscopy and culture results
	Smear-positive specimens (n = 19)			Smear-negative specimens (n = 60)			All specimens (n = 79)
	No. of cultures positive for MTC	No. of cultures positive for NTM	No. of negative cultures	No. of cultures positive for MTC	No. of cultures positive for NTM	No. of negative cultures	No. of cultures positive for MTC	No. of cultures positive for NTM	No. of negative cultures
M. tuberculosis detected	14	0	0	1	0	2c	15	0	2
M. tuberculosis not detected	0	5	0	3b	2	50	3	7	50
Not interpretable	0	0	0	0	0	2	0	0	2
Total	14	5	0	4	2	54	18	7	54

^aAmong the 79 specimens were 71 respiratory specimens (57 sputa, 10 bronchial aspirates, and 4 bronchoalveolar lavage fluids) and 8 nonrespiratory specimens (3 biopsies, 1 CSF, 1 ascitic fluid, 1 pleural fluid, 1 pus, and 1 pharynx aspirate).

^bAll nonrespiratory specimens.

^cBoth were respiratory specimens.