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Distribution of rifabutin and rifampin MICs. MICs for both rifampin and rifabutin were determined using either standard MHII culture conditions or modified RPMI plus serum culture conditions for A. baumannii, S. aureus, E. coli, K. pneumoniae, and P. aeruginosa. The numbers of clinical isolates tested are given in the symbol keys. Statistical comparisons were made by Mann-Whitney test comparing MICs obtained in RPMI and MHII.
