Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay
Background: The tuberculosis and infections caused by nontuberculous mycobacterial (NTM) species are increasing in patients presented with respiratory illness, and it is crucial to document the epidemiology of these infections. Objectives: To study the mycobacterial species and in vitro drug suscept...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2014-01-01
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| Series: | International Journal of Mycobacteriology |
| Subjects: | |
| Online Access: | http://www.ijmyco.org/article.asp?issn=2212-5531;year=2014;volume=3;issue=2;spage=82;epage=87;aulast=Ng |
| _version_ | 1818318063595945984 |
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| author | Kee Peng Ng Devi Velayuthan Rukumani Jennifer Chong Harvinder Kaur |
| author_facet | Kee Peng Ng Devi Velayuthan Rukumani Jennifer Chong Harvinder Kaur |
| author_sort | Kee Peng Ng |
| collection | DOAJ |
| description | Background: The tuberculosis and infections caused by nontuberculous mycobacterial (NTM) species are increasing in patients presented with respiratory illness, and it is crucial to document the epidemiology of these infections.
Objectives: To study the mycobacterial species and in vitro drug susceptibility trends of Mycobacterium tuberculosis found in the respiratory specimens.
Materials and methods: A prospective descriptive study from July 2009 to December 2012. The BACTEC MGIT system tubes with growth were used in the study. GenoType Mycobacterium (Hain Diagnostika, Nehren, Germany) assays were used to identify the mycobacteria. The drug susceptibility testing was performed by the MGIT 960 system.
Results: A total of 1745 MGIT 960 system positive tubes were included. M. tuberculosis complex (MTC) constituted 67.45% of the yield isolated, 30.83% were nontuberculous mycobacterial species, 0.17% were Mycobacterium bovis BCG and 1.55% were not interpretable to species levels. Mycobacterium fortuitum (45.71%), Mycobacterium abscessus (26.21%) and Mycobacterium intracellulare (10.41%) were major NTM identified. The drug susceptibility study showed that 6.88% (81/1177) of MTC were drug-resistant TB, 56 isolates were resistant to one of the first-line anti-TB drugs, 25 isolates were found to be resistant to 2 or more first-line anti-TB drugs, of which 19 (20.46%) were MDR-TB and one of the isolates in the year 2011 was confirmed XDR-TB.
Conclusion: M. tuberculosis, M. fortuitum, M. abscessus and M. intracellulare were major mycobacterial species detected in the respiratory samples. The drug susceptibility testing showed that the majority of MTC were sensitive to first-line anti-TB drugs. |
| first_indexed | 2024-12-13T09:47:16Z |
| format | Article |
| id | doaj.art-401c05c54c56494ca8eb57c04b3f966b |
| institution | Directory Open Access Journal |
| issn | 2212-5531 2212-554X |
| language | English |
| last_indexed | 2024-12-13T09:47:16Z |
| publishDate | 2014-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | International Journal of Mycobacteriology |
| spelling | doaj.art-401c05c54c56494ca8eb57c04b3f966b2022-12-21T23:52:00ZengWolters Kluwer Medknow PublicationsInternational Journal of Mycobacteriology2212-55312212-554X2014-01-0132828710.1016/j.ijmyco.2014.03.005Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assayKee Peng NgDevi Velayuthan RukumaniJennifer ChongHarvinder KaurBackground: The tuberculosis and infections caused by nontuberculous mycobacterial (NTM) species are increasing in patients presented with respiratory illness, and it is crucial to document the epidemiology of these infections. Objectives: To study the mycobacterial species and in vitro drug susceptibility trends of Mycobacterium tuberculosis found in the respiratory specimens. Materials and methods: A prospective descriptive study from July 2009 to December 2012. The BACTEC MGIT system tubes with growth were used in the study. GenoType Mycobacterium (Hain Diagnostika, Nehren, Germany) assays were used to identify the mycobacteria. The drug susceptibility testing was performed by the MGIT 960 system. Results: A total of 1745 MGIT 960 system positive tubes were included. M. tuberculosis complex (MTC) constituted 67.45% of the yield isolated, 30.83% were nontuberculous mycobacterial species, 0.17% were Mycobacterium bovis BCG and 1.55% were not interpretable to species levels. Mycobacterium fortuitum (45.71%), Mycobacterium abscessus (26.21%) and Mycobacterium intracellulare (10.41%) were major NTM identified. The drug susceptibility study showed that 6.88% (81/1177) of MTC were drug-resistant TB, 56 isolates were resistant to one of the first-line anti-TB drugs, 25 isolates were found to be resistant to 2 or more first-line anti-TB drugs, of which 19 (20.46%) were MDR-TB and one of the isolates in the year 2011 was confirmed XDR-TB. Conclusion: M. tuberculosis, M. fortuitum, M. abscessus and M. intracellulare were major mycobacterial species detected in the respiratory samples. The drug susceptibility testing showed that the majority of MTC were sensitive to first-line anti-TB drugs.http://www.ijmyco.org/article.asp?issn=2212-5531;year=2014;volume=3;issue=2;spage=82;epage=87;aulast=NgMycobacterium tuberculosisNontuberculous mycobacterial speciesBACTEC MGIT systemGenoType Mycobacterium assaysDrug-resistant TB |
| spellingShingle | Kee Peng Ng Devi Velayuthan Rukumani Jennifer Chong Harvinder Kaur Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay International Journal of Mycobacteriology Mycobacterium tuberculosis Nontuberculous mycobacterial species BACTEC MGIT system GenoType Mycobacterium assays Drug-resistant TB |
| title | Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay |
| title_full | Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay |
| title_fullStr | Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay |
| title_full_unstemmed | Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay |
| title_short | Identification of Mycobacterium species following growth detection with the BACTEC MGIT 960 system by DNA line probe assay |
| title_sort | identification of mycobacterium species following growth detection with the bactec mgit 960 system by dna line probe assay |
| topic | Mycobacterium tuberculosis Nontuberculous mycobacterial species BACTEC MGIT system GenoType Mycobacterium assays Drug-resistant TB |
| url | http://www.ijmyco.org/article.asp?issn=2212-5531;year=2014;volume=3;issue=2;spage=82;epage=87;aulast=Ng |
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