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Journal of Clinical Microbiology, March 2000, p. 1227-1230, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Two Liquid Medium Systems, Mycobacteria Growth Indicator Tube and MB Redox Tube, for Mycobacterium tuberculosis Isolation from Sputum Specimens

L. Heifets,1,* T. Linder,2 T. Sanchez,1 D. Spencer,1 and J. Brennan1

National Jewish Medical and Research Center, Denver, Colorado,1 and Missouri State Laboratory, Mt. Vernon, Missouri2

Received 27 July 1999/Returned for modification 16 November 1999/Accepted 30 December 1999

Two manual liquid medium systems, the Mycobacteria Growth Indicator Tube (MGIT) and MB Redox tube systems, were evaluated in comparison to the radiometric BACTEC-460 semiautomated system for recovery of Mycobacterium tuberculosis from sputum specimens. The highest level of recovery, from a total of 77 culture-positive specimens, occurred with the BACTEC-460 system (92.2%), followed by the MB Redox tube (80.5%) and the MGIT (63.6%) systems. The shortest time to detection was observed also among the cultures in BACTEC-460: a mean of 12 days to a growth index (GI) of 10 and 15 days to a GI of 500. The mean times for the other systems were 16 days for the MB Redox tube system and 17.4 days for the MGIT system. The proportion of cultures grown after more than 3 weeks of incubation was only 2.8 or 8.4% in BACTEC-460 (for a GI of 10 or 500) but 17.7% in MB Redox and 22.5% in MGIT. Despite these differences in comparison to the BACTEC-460 system and some differences between the MGIT and MB Redox tube systems, either of the two manual liquid medium systems presents a reasonable alternative to the BACTEC-460 system, especially for laboratories with a limited workload, and a valuable element in the laboratory protocol, in conjunction with solid media, for obtaining rapid detection of growth from about 80% of culture-positive specimens and for better overall recovery of M. tuberculosis.

* Corresponding author. Mailing address: National Jewish Medical and Research Center, 1400 Jackson St., Denver, CO 80206. Phone: (303) 398-1384. Fax: (303) 398-1953. E-mail: heifetsl{at}njc.org.

Journal of Clinical Microbiology, March 2000, p. 1227-1230, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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