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Evaluation of the effect of efflux inhibitors on the accumulation of ethidium bromide on the M. tuberculosis strains in study. Ethidium bromide (EtBr) was used at the equilibrium concentration for each strain as follows: 0.25 μg/ml for H37Rv, MtbPT1, MtbPT5, MtbPT7, and MtbPT11; 0.5 μg/ml, MtbPT3; and 1 μg/ml, MtbBR1; each efflux inhibitor was tested at half MIC.
