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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Comparison of mycobacteria growth indicator tube with BACTEC 460 for detection and recovery of mycobacteria from clinical specimens.
Journal of Clinical Microbiology 1996 September
We compared the Mycobacteria Growth Indicator Tube (MGIT) system with the BACTEC 460 (B460) and Lowenstein Jensen (LJ) systems for the recovery of mycobacteria (acid-fast bacteria [AFB]) from 1,441 clinical specimens. Excluding 13 isolates of Mycobacterium gordonae, 178 significant AFB isolates were recovered from 113 patients. Isolates (119) of the Mycobacterium avium complex (MAC) accounted for 67% of all isolates, while isolates (30) of the Mycobacterium tuberculosis complex (MTB) accounted for 17% of isolates. The MGIT system recovered 98 (82%) MAC and 27 (90%) MTB isolates, while the B460 system recovered 101 (85%) MAC and 28 (93%) MTB isolates and the LJ system recovered 91 (76%) MAC and 25 (83%) MTB isolates. Overall, the MGIT system recovered 152 isolates of AFB (85.4% sensitivity), and the B460 and LJ systems recovered 151 (84.8% sensitivity) and 137 (76.9% sensitivity) AFB isolates, respectively. The recoveries of AFB with combinations of media were as follows: MGIT + LJ, 93.2%; B460 + LJ, 92.1%; and MGIT + B460, 96.6%. Although the sensitivity of MGIT was equivalent to that of B460, MGIT required a longer incubation (median, 11 days) than did B460 (median, 8 days) to become positive (P < 0.05).
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