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Distribution of the minimum inhibitory concentrations (MIC) (x-axis, units are µg/mL) of six antimicrobial agents against the 171 clinical isolates of Clostridium difficile on supplemented Brucella agar (gray bars) and modified CD agar (black bars). The dotted lines represent the breakpoints for the antimicrobials, with the exception of rifaximin, which does not presently have breakpoint criteria.
