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Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases 6/2016

02.04.2016 | Original Article

Early detection of Mycobacterium tuberculosis complex in BACTEC MGIT cultures using nucleic acid amplification

verfasst von: S. Y. Lin, S. C. Hwang, Y. C. Yang, C. F. Wang, Y. H. Chen, T. C. Chen, P. L. Lu

Erschienen in: European Journal of Clinical Microbiology & Infectious Diseases | Ausgabe 6/2016

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Abstract

We evaluated the application of nucleic acid amplification (NAA) in liquid cultures for the early detection of Mycobacterium tuberculosis. The Cobas TaqMan MTB test, IS6110 real-time PCR, and hsp65 PCR-restriction fragment length polymorphism (RFLP) analysis were used to detect BACTEC MGIT 960 (MGIT) cultures on days 3, 5, 7, and 14. The procedure was initially tested with a reference strain, H37Rv (ATCC 27294). Subsequently, 200 clinical specimens, including 150 Acid Fast bacillus (AFB) smear-positive and 50 AFB smear-negative samples, were examined. The Cobas TaqMan MTB test and IS6110-based PCR analysis were able to detect M. tuberculosis after 1 day when the inoculum of H37Rv was >3 x 10−2 CFU/ml. After a 5-day incubation in the MGIT system, all three NAA assays had a positive detection regardless of the inoculum size. After a 1-day incubation of the clinical specimens in the MGIT system, the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for the Cobas TaqMan MTB assay were 70.2%, 100%, 100%, and 82.3% respectively. For IS6110-based PCR analysis, these values were 63.1%, 100%, 100%, and 78.9%, and were 88.1%, 100%, 100%, and 92.1% respectively for hsp65 PCR-RFLP analysis. After a 3-day incubation, the specificity and PPV were 100% for all three NAA tests; the Cobas TaqMan MTB assay had the best sensitivity (97.6%) and NPV (98.3%). The sensitivity, specificity, PPV, and NPV for conventional culture analysis were 98.8%, 100%, 100%, and 99.1%. Thus, NAA may be useful for the early detection of M. tuberculosis after 3 days in MGIT.
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Metadaten
Titel
Early detection of Mycobacterium tuberculosis complex in BACTEC MGIT cultures using nucleic acid amplification
verfasst von
S. Y. Lin
S. C. Hwang
Y. C. Yang
C. F. Wang
Y. H. Chen
T. C. Chen
P. L. Lu
Publikationsdatum
02.04.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Clinical Microbiology & Infectious Diseases / Ausgabe 6/2016
Print ISSN: 0934-9723
Elektronische ISSN: 1435-4373
DOI
https://doi.org/10.1007/s10096-016-2625-9

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