NDLI: Feasibility of the GenoType MTBDRsl Assay for Fluoroquinolone, Amikacin-Capreomycin, and Ethambutol Resistance Testing of Mycobacterium tuberculosis Strains and Clinical Specimens▿

Content Provider	PubMed Central
Author	Hillemann, Doris Sabine, Rüsch-gerdes Richter, Elvira
Abstract	The new GenoType Mycobacterium tuberculosis drug resistance second line (MTBDRsl) assay (Hain Lifescience, Nehren, Germany) was tested on 106 clinical isolates and directly on 64 sputum specimens for the ability to detect resistance to fluoroquinolones, injectable drugs (amikacin or capreomycin), and ethambutol in Mycobacterium tuberculosis strains. A total of 63 strains harboring fluoroquinolone, amikacin/capreomycin, or ethambutol resistance and 43 fully susceptible strains were comparatively analyzed with the new MTBDRsl assay, by DNA sequencing, and by conventional drug susceptibility testing in liquid and solid media. No discrepancies were obtained in comparison with the DNA sequencing results. Fluoroquinolone resistance was detected in 29 (90.6%) of 32, amikacin/capreomycin resistance was detected in 39/39 (84.8%/86.7%) of 46/45, and ethambutol resistance was detected in 36 (69.2%) of 52 resistant strains. A total of 64 sputum specimens (42 smear positive, 12 scanty, and 10 smear negative) were tested with the new MTBDRsl assay, and the results were compared with those of conventional drug susceptibility testing. Fluoroquinolone resistance was detected in 8 (88.9%) of 9, amikacin/capreomycin resistance was detected in 6/7 (75.0%/87.5%) of 8, and ethambutol resistance was detected in 10 (38.5%) of 26 resistant strains. No mutation was detected in susceptible strains. The new GenoType MTBDRsl assay represents a reliable tool for the detection of fluoroquinolone and amikacin/capreomycin resistance and to a lesser extent also ethambutol resistance. In combination with a molecular test for detection of rifampin and isoniazid resistance, the potential for the detection of extensively resistant tuberculosis within 1 to 2 days can be postulated.
Related Links	http://dx.doi.org/10.1128/jcm.00081-09
Ending Page	1772
Page Count	6
Starting Page	1767
File Format	PDF
ISSN	00951137
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	6
Volume Number	47
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2009-06-01
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Microbiology (medical) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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