Evaluation of the BACTEC MGIT 960 SL DST Kit and the GenoType MTBDRsl Test for Detecting Extensively Drug-resistant Tuberculosis Cases
- PMID: 29123441
- PMCID: PMC5665627
- DOI: 10.5152/eurasianjmed.2017.17040
Evaluation of the BACTEC MGIT 960 SL DST Kit and the GenoType MTBDRsl Test for Detecting Extensively Drug-resistant Tuberculosis Cases
Abstract
Objective: The present study aimed to evaluate the performances of the BACTEC MGIT 960 SL DST kit and the GenoType MTBDRsl test for detecting second-line antituberculosis drug resistance in Multidrug-resistant TB (MDR-TB) cases.
Materials and methods: Forty-six MDR-TB strains were studied. Second-line antituberculosis drug resistances were detected using the BACTEC MGIT 960 SL DST kit and the GenoType MTBDRsl test. The Middlebrook 7H10 agar proportion method was used as the reference test.
Results: The sensitivity and specificity values for the BACTEC MGIT 960 SL DST kit were both 100% for amikacin, kanamycin, capreomycin (4 µg/mL), and ofloxacin; 100% and 95.3%, respectively, for capreomycin (10 µg/mL); and 85.7% and 100%, respectively, for moxifloxacin (0.5 µg/mL). The sensitivity and specificity values for the GenoType MTBDRsl test to detect fluoroquinolone and aminoglycoside/cyclic peptide resistance were 88.9% and 100%, respectively, for ofloxacin and 85.7% and 94.9%, respectively, for moxifloxacin (0.5 µg/mL). The accuracy of the GenoType MTBDRsl assay for kanamycin, capreomycin, ofloxacin, and moxifloxacin was lower than that of the BACTEC MGIT 960 SL DST.
Conclusion: The BACTEC MGIT 960 SL DST kit and the GenoType MTBDRsl were successful in detecting second-line antituberculosis drug resistance. Preliminary results of the GenoType MTBDRsl are very valuable for early treatment decisions, but we still recommend additional BACTEC MGIT 960 SL DST kit usage in the routine evaluation of drug-resistant tuberculosis.
Amaç: Bu çalışmanın amacı, çok ilaca dirençli tüberküloz (ÇİD-TB) vakalarında, BACTEC MGIT 960 SL DST kitinin ve GenoType MTBDRsl testinin, ikincil antitüberküloz ilaçlara karşı duyarlılığı saptamasındaki performansının değerlendirilmesidir.
Gereç ve yöntem: 46 tane ÇİD-TB suşu çalışıldı. BACTEC MGIT 960 SL DST kiti ve GenoType MTBDRsl testi ile ikincil antitüberküloz ilaçlara karşı direnç durumu tespit edilmiştir. Middlebrook 7H10 agar proporsiyon metodu referans yöntem olarak kullanılmıştır.
Bulgular: BACTEC MGIT 960 SL DST kitinin duyarlılık ve özgüllüğü; amikasin, kanamisin, kapreomisin (4 µg/mL) ve ofloksasin için her ikisi de %100; kapreomisin (10 µg/mL) için sırasıyla %100 ve %95,3; moksifloksasin (0,5 µg/mL) için sırasıyla %85,7 ve 100% olarak bulunmuştur. GenoType MTBDRsl testinin florokinolon ve aminoglikozid/siklik peptit direnci tespitinde duyarlılık ve özgüllüğü; ofloksasin için sırasıyla %88,9 ve %100; moksifloksasin (0,5 µg/mL) için sırasıyla %85,7 ve %94,9 olarak bulunmuştur. GenoType MTBDRsl yönteminin kanamisin, kapreomisin, ofloksasin ve moksifloksasin için doğruluğu, BACTEC MGIT 960 SL DST kitine göre daha düşük saptanmıştır.
Sonuç: BACTEC MGIT 960 SL DST kiti ve GenoType MTBDRsl testi ikincil antitüberküloz ilaçlara karşı direncin saptanmasında başarılı bulunmuştur. GenoType MTBDRsl testi ile elde edilen ön bilgiler, erken dönemde tedavi kararlarının alınmasında değerlidir, ancak ilaçlara dirençli tüberküloz olgularının rutin değerlendirilmesinde ek olarak BACTEC MGIT 960 SL DST kitinin kullanılmasını tavsiye etmekteyiz.
Keywords: MDR-TB; Mycobacterium tuberculosis; agar proportion method; second-line drug susceptibility.
Conflict of interest statement
Conflict of Interest: No conflict of interest was declared by the authors.
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