Table 1.

Isolation of mycobacteria with the BACTEC 460TB system, the MGIT 960 system, and LJ medium

Mycobacterium(a)Total no. (%) of isolates recovered in all mediaNo. (%) of isolates recovered ina:Pd
460960LJ460 + LJ960 + LJ
M. tuberculosiscomplex57 (44.9)53 (93.0)51 (89.5)45 (78.9)54 (94.7)54 (94.7)NS
All NTMb 70 (55.1)63 (90.0)48 (68.6)33 (47.1)64 (91.4)49 (70.0)0.001
M. avium 30 (23.6)29 (96.7)25 (83.3)20 (66.7)29 (96.7)25 (83.3)NS
M. intracellulare 8 (6.3)7 (87.5)7 (87.5)5 (62.5)7 (87.5)7 (87.5)NS
M. malmoense 2 (1.6)2 (100.0)2 (100.0)0 (0.0)2 (100.0)2 (100.0)ND
M. marinum 1 (0.8)1 (100.0)1 (100.0)1 (100.0)1 (100.0)1 (100.0)ND
M. xenopi 4 (3.1)4 (100.0)1 (25.0)0 (0.0)4 (100.0)1 (25.0)ND
M. scrofulaceum 1 (0.8)0 (0.0)1 (100.0)0 (0.0)0 (0.0)1 (100.0)ND
M. fortuitumcomplex9 (7.1)7 (77.8)2 (22.2)2 (22.2)8 (88.9)3 (33.3)NS
M. chelonae 1 (0.8)1 (100.0)1 (100.0)1 (100.0)1 (100.0)1 (100.0)ND
M. gordonae 11 (8.7)10 (90.9)6 (54.5)3 (27.3)10 (90.9)6 (54.5)NS
M. flavescens 1 (0.8)0 (0.0)1 (100.0)0 (0.0)0 (0.0)1 (100.0)ND
M. smegmatis 1 (0.8)1 (100.0)1 (100.0)1 (100.0)1 (100.0)1 (100.0)ND
Mycobacteriumspp.c 1 (0.8)1 (100.0)0 (0.0)0 (0.0)1 (100.0)0 (0.0)ND
Total127 (100.0)116 (91.3)99 (78.0)78 (61.4)118 (92.9)103 (81.1)0.005
  • a Abbreviations: 460, BACTEC 460TB system; 960, BACTEC MGIT 960 system; LJ, LJ medium.

  • b Sum of all nontuberculous mycobacteria recovered in this study.

  • c Mycobacterium spp., not further differentiated, as recovered only once out of seven different respiratory samples; the patient was well, and the strain was notM. tuberculosis complex.

  • d For comparison of the BACTEC 460TB or MGIT960 system with LJ medium results. Abbreviations: NS, not significant; ND, not done.