Journal of Yeungnam Medical Science

Original Articles

Usefulness of the BACTEC MGIT 960 System for Mycobacterial Culture and TB Ag MPT64 Immunochromatographic Assay to Identify Mycobacterium tuberculosis.: Seung Hun Lee, Min Jeong Lee, Jeong Mi Lee, Su Jin Yim, Seung Jun Lee, You Eun Kim, Yu Ji Cho, Yi Yeong Jeong, Ho Cheol Kim, Jong Deog Lee, Sun Joo Kim, Young Sil Hwang; Yeungnam Univ J Med. 2012;29(2):83-88. Published online December 31, 2012; DOI: https://doi.org/10.12701/yujm.2012.29.2.83

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BACKGROUND
This study was conducted to evaluate the usefulness of the BACTEC MGIT (Mycobacterium Growth Indicator Tube) 960 system for mycobacteria culture and immunochromatographic assay to identify Mycobacterium tuberculosis (MTB) in positive MGIT culture. METHODS: Mycobacteria-culture-positive cases were retrospectively analyzed from December 2010 to July 2011. The detection rates and the recovery times of the mycobacteria between the Ogawa media and the MGIT were compared. An immunochromatographic assay (ICA) (SD BIO-LINE) was also performed in the positive MGIT culture for identification, and the results were compared with those of the Ogawa media in the Korea National Tuberculosis Association. RESULTS: Among the 261 patients (M:F, 168:93; mean age, 61.6+/-17.16 yrs), 450 specimens (sputa, 365; bronchial washing, 61; and pleural effusion, 24) were found positive with mycobacteria. Mycobacteria were grown both on the MGIT and Ogawa media in 310 cases (68.9%); only on the MGIT in 115 cases (22.6%); and only on the Ogawa media in 25 cases (5.5%) (p<0.05).The recovery time was 28.2+/-8.9 days in the Ogawa media and 11.1+/-5.8 days in the MGIT (p<0.05). Among the 127 cases from the positive MGIT culture, all 92 cases that were confirmed as MTB cases bythe Korea National Tuberculosis Association were identified as MTB by ICA, with 100% sensitivity. CONCLUSION: MGIT increases the detection rate and shortens the recovery time of mycobacteria in clinical respiratory specimens, and the TB Ag MPT64 kit using ICA is useful in identifying MTB in a positive MGIT culture.

Citations

Citations to this article as recorded by

A Low Cost/Low Power Open Source Sensor System for Automated Tuberculosis Drug Susceptibility Testing
Kyukwang Kim, Hyeong Kim, Hwijoon Lim, Hyun Myung
Sensors.2016; 16(6): 942. CrossRef

Comparison of REP13E12 PCR with Amplicor MTB for the Detection of Mycobacterium tuberculosis in Respiratory Specimens: Tae-Yoon Lee; Yeungnam Univ J Med. 2007;24(2 Suppl):S456-462. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S456

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Abstract PDF: Background
s：In recent years, the incidence of tuberculosis has increased mainly in high-risk populations. Classical laboratory diagnostic methods for tuberculosis have low sensitivity and time consuming procedures. Thus, it is important to identify the presence of Mycobacterium tuberculosis in the clinical specimens earlier than the culture results for the decision to initiate anti-tuberculosis therapy. Lee et al. reported a species-specific repeated sequence from a Korean M. tuberculosis isolate, which was later proved to be a part of REP13E12 repetitive sequence. Materials and Methods：In this study, we compared the acid-fast staining, culture, Amplicor MTB (Roche), and REP13E12 PCR for detection of M. tuberculosis using 88 clinical samples. The sensitivity, specificity, positive and negative predictive values were compared.
Results
：REP13E12 PCR showed equivalent score to Amplicor MTB. Both PCR-based methods showed better score than conventional stain and culture methods.
Conclusion
：This result suggested that REP13E12 PCR is helpful for the rapid detection of the M. tuberculosis from clinical specimens.

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