In vitro time-kill curves study of three antituberculous combinations against Mycobacterium tuberculosis clinical isolates.

Abstract:

:The objective of this study was to examine the in vitro synergism of three-drug combinations against Mycobacterium tuberculosis (levofloxacin/linezolid/ethambutol, levofloxacin/amikacin/ethambutol and levofloxacin/linezolid/amikacin) using the time-kill curves method. In total, 8 multidrug-resistant and 12 drug-susceptible M. tuberculosis isolates were used. Minimum inhibitory concentrations (MICs) of the isolates for each drug were determined by the proportions method. Time-kill curves were studied for the three combinations proposed over 14 days using two different protocols. In protocol 1, 0.5× MIC for each drug was used. In protocol 2, 0.5× MIC for levofloxacin and linezolid and 0.25× MIC for amikacin and ethambutol were used. The MICs for all of the isolates studied were 0.5 mg/L for levofloxacin and linezolid and 2.5 mg/L for ethambutol and amikacin. All of the combinations displayed an additive activity compared with the most active individual drug. In conclusion, these results demonstrate that the three combinations tested were equally effective against M. tuberculosis isolates. The study of antituberculous combinations using in vitro methods is an excellent first step to predict their effect in clinical development phases as well as to test new regimens of the antituberculous drugs currently available.

authors

López-Gavín A,Tudó G,Rey-Jurado E,Vergara A,Hurtado JC,Gonzalez-Martín J

doi

10.1016/j.ijantimicag.2015.10.016

subject

Has Abstract

pub_date

2016-01-01 00:00:00

pages

97-100

issue

1

eissn

0924-8579

issn

1872-7913

pii

S0924-8579(15)00367-2

journal_volume

47

pub_type

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