1. Second-line drug susceptibility breakpoints for Mycobacterium tuberculosis using the MODS assay
- Author
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Trollip, AP, Moore, D, Coronel, J, Caviedes, L, Klages, S, Victor, T, Romancenco, E, Crudu, V, Ajbani, K, Vineet, VP, Rodrigues, C, Jackson, RL, Eisenach, K, Garfein, RS, Rodwell, TC, Desmond, E, Groessl, EJ, Ganiats, TG, and Catanzaro, A
- Subjects
Biomedical and Clinical Sciences ,Clinical Sciences ,Good Health and Well Being ,Amikacin ,Antitubercular Agents ,Capreomycin ,Drug Resistance ,Multiple ,Bacterial ,Fluoroquinolones ,Humans ,India ,Kanamycin ,Microbial Sensitivity Tests ,Microscopy ,Moldova ,Moxifloxacin ,Mycobacterium tuberculosis ,Ofloxacin ,Peru ,Predictive Value of Tests ,Reproducibility of Results ,South Africa ,Sputum ,Tuberculosis ,Multidrug-Resistant ,Tuberculosis ,Pulmonary ,tuberculosis ,fluoroquinolones ,aminoglycosides ,drug susceptibility testing ,MODS ,Cardiorespiratory Medicine and Haematology ,Microbiology ,Cardiovascular medicine and haematology ,Clinical sciences ,Epidemiology - Abstract
ObjectiveTo establish breakpoint concentrations for the fluoroquinolones (moxifloxacin [MFX] and ofloxacin [OFX]) and injectable second-line drugs (amikacin [AMK], kanamycin [KM] and capreomycin [CPM]) using the microscopic observation drug susceptibility (MODS) assay.SettingA multinational study conducted between February 2011 and August 2012 in Peru, India, Moldova and South Africa.DesignIn the first phase, breakpoints for the fluoroquinolones and injectable second-line drugs (n = 58) were determined. In the second phase, MODS second-line drug susceptibility testing (DST) as an indirect test was compared to MGIT™ DST (n = 89). In the third (n = 30) and fourth (n = 156) phases, we determined the reproducibility and concordance of MODS second-line DST directly from sputum.ResultsBreakpoints for MFX (0.5 μg/ml), OFX (1 μg/ml), AMK (2 μg/ml), KM (5 μg/ml) and CPM (2.5 μg/ml) were determined. In all phases, MODS results were highly concordant with MGIT DST. The few discrepancies suggest that the MODS breakpoint concentrations for some drugs may be too low.ConclusionMODS second-line DST yielded comparable results to MGIT second-line DST, and is thus a promising alternative. Further studies are needed to confirm the accuracy of the drug breakpoints and the reliability of MODS second-line DST as a direct test.
- Published
- 2014