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- Title
Bedaquiline and linezolid MIC distributions and epidemiological cut-off values for Mycobacterium tuberculosis in the Latin American region.
- Authors
Lopez, Beatriz; Oliveira, Rosangela Siqueira de; Pinhata, Juliana M W; Chimara, Erica; Ascencio, Edson Pacheco; Guerra, Zully M Puyén; Wainmayer, Ingrid; Simboli, Norberto; Granado, Mirtha Del; Palomino, Juan Carlos; Ritacco, Viviana; Martin, Anandi; Siqueira de Oliveira, Rosangela; Pacheco Ascencio, Edson; Puyén Guerra, Zully M; Del Granado, Mirtha
- Abstract
<bold>Objectives: </bold>To describe the distributions of bedaquiline and linezolid MIC values for the Mycobacterium tuberculosis WT population and to define the corresponding epidemiological cut-offs (ECOFFs) in three Latin American countries.<bold>Methods: </bold>MICs of bedaquiline and linezolid were determined by the resazurin microtitre assay (REMA). In phase 1, interlaboratory reproducibility was assessed using a panel of 10 fully susceptible M. tuberculosis strains. Phase 2 involved MIC determination for 248 clinical isolates from Argentina (n = 58), Brazil (n = 100) and Peru (n = 90) from patients who were treatment-naive for bedaquiline and linezolid. We then determined the ECOFFs for bedaquiline and linezolid by the eyeball method and the ECOFFinder statistical calculator.<bold>Results: </bold>Phase 1: REMA MIC values in the three sites were either identical to each other or differed by one 2-fold dilution from the consensus value with the exception of a single value. Phase 2: the bedaquiline MIC range was 0.0039-0.25 mg/L for pan-susceptible and drug-resistant isolates combined. The linezolid MIC range was 0.062-0.5 mg/L for pan-susceptible isolates and 0.031-4 mg/L for drug-resistant isolates. ECOFFs were 0.125 mg/L for bedaquiline and 0.50 mg/L for linezolid.<bold>Conclusions: </bold>REMA is reproducible and robust for the determination of bedaquiline and linezolid MIC distributions and ECOFF values when applied in laboratories of medium/low-resource countries. We suggest that WT MIC distributions for both drugs should be used as a monitoring tool to control the possible rapid emergence of resistance.
- Subjects
LINEZOLID; MYCOBACTERIUM tuberculosis; RESAZURIN; DRUG resistance; EPIDEMIOLOGICAL models
- Publication
Journal of Antimicrobial Chemotherapy (JAC), 2019, Vol 74, Issue 2, p373
- ISSN
0305-7453
- Publication type
journal article
- DOI
10.1093/jac/dky414