Evaluation of the bactec MGIT 960 TB system for recovery and identification of Mycobacterium tuberculosis complex in a high volume tertiary care centre
Aim: To evaluate the performance of an automated BACTEC MGIT 960, a non-radioactive, non-invasive liquid culture system for cultivation of M. tuberculosis complex in terms of recovery rate and time. Materials and Methods: From March 2005 to December 2007, 14,597 specimens were processed using the MG...
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Published in | Indian journal of medical microbiology Vol. 27; no. 3; p. 217 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
India
Medknow Publications on behalf of Indian Association of Medical Microbiology
01.07.2009
Elsevier Limited |
Subjects | |
Online Access | Get full text |
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Summary: | Aim: To evaluate the performance of an automated BACTEC MGIT 960, a
non-radioactive, non-invasive liquid culture system for cultivation of
M. tuberculosis complex in terms of recovery rate and time. Materials
and Methods: From March 2005 to December 2007, 14,597 specimens were
processed using the MGIT 960 system and the results were compared with
conventional L.J medium. We standardised r-nitro benzoic acid (PNBA)
assay on MGIT 960 TB system for identification of M. tuberculosis
complex and evaluated its usefulness by comparing the results with an
in-house molecular assay and sequencing. Results and Discussion: Of
the total 6143 (42%) isolates positive for M. tuberculosis complex,
6015 (41%) were positive by MGIT 960 TB system. In contrast, 3526 (24%)
M. tuberculosis complex isolates grew on the conventional L.J medium.
The mean turn around time for mycobacterial growth in smear-positive
specimens was nine days for MGIT 960, and 38 days for L.J. medium
whereas in smear negative specimens it was 16 days by MGIT vs. 48 days
by L.J. Conclusion: MGIT 960 system with PNBA assay for identification
of M. tuberculosis complex is a rapid and useful method in
laboratories processing a large number of specimens. |
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ISSN: | 0255-0857 1998-3646 |
DOI: | 10.4103/0255-0857.53203 |