Please use this identifier to cite or link to this item: http://sgc.anlis.gob.ar/handle/123456789/1333
Title: Bedaquiline and linezolid MIC distributions and epidemiological cut-off values for Mycobacterium tuberculosis in the Latin American region
Authors: López, Beatriz 
Siqueira de Oliveira, Rosangela 
Pinhata, Juliana M W 
Chimara, Erica 
Pacheco Ascencio, Edson 
Puyén Guerra, Zully M 
Wainmayer, Ingrid 
Simboli, Norberto 
Del Granado, Mirtha 
Palomino, Juan Carlos 
Ritacco, Viviana 
Martin, Anandi 
Keywords: Tuberculosis Resistente a Múltiples Medicamentos;Antituberculosos;Mycobacterium tuberculosis
Issue Date: 1-Feb-2019
Journal: The Journal of antimicrobial chemotherapy 
Abstract: 
Objectives: 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.

Methods: 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.

Results: 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.

Conclusions: 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.
Description: 
Fil: López, Beatriz. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Enfermedades Infecciosas. Departamento de Bacteriologia; Argentina.

Fil: Siqueira de Oliveira, Rosangela. Instituto Adolfo Lutz Sao Paulo. Centro de Bacteriología. Nucleo de Tuberculose e Micobacterioses; Brasil.

Fil: Pinhata, Juliana M. W. Instituto Adolfo Lutz Sao Paulo. Centro de Bacteriología. Nucleo de Tuberculose e Micobacterioses; Brasil.

Fil: Chimara, Erica. Instituto Adolfo Lutz Sao Paulo. Centro de Bacteriología. Nucleo de Tuberculose e Micobacterioses; Brasil.

Fil: Pacheco Ascencio, Edson. Instituto Nacional de Salud. Laboratorio de Referencia Nacional de Micobacterias; Lima, Perú.

Fil: Puyén Guerra, Zully M. Instituto Nacional de Salud. Laboratorio de Referencia Nacional de Micobacterias; Lima, Perú.

Fil: Wainmayer, Ingrid. ANLIS Dr.C.G.Malbrán. Insituto Nacional de Enfermededades Infecciosas. Servicio de Micobacterias; Argentina.

Fil: Simboli, Norberto. ANLIS Dr.C.G.Malbrán. Insituto Nacional de Enfermededades Infecciosas. Servicio de Micobacterias; Argentina.

Fil: Del Granado, Mirtha. Pan American Health Organization; Estados Unidos.

Fil: Palomino, Juan Carlos. Ghent University. Department of Biochemistry and Microbiology. Faculty of sciences; Belgica.

Fil: Ritacco, Viviana. ANLIS Dr.C.G.Malbrán. Insituto Nacional de Enfermededades Infecciosas. Servicio de Micobacterias; Argentina.

Fil: Martín, Anandi. Université catholique de Louvain. Institute of Experimental and Clinical Research. Laboratory of Medical Microbiology; Belgica.
URI: http://sgc.anlis.gob.ar/handle/123456789/1333
DOI: 10.1093/jac/dky414
Appears in Collections:Publicaciones INEI

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