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. 2015 Dec 31;60(1):609–612. doi: 10.1128/AAC.01574-15

FIG 1.

FIG 1

Change in colistin MIC of resistant mutants obtained by serial passage in colistin-free medium. (A) A. baumannii, (B) P. aeruginosa, (C) K. pneumoniae, and (D) E. coli colistin-resistant mutant strains. The y axis represents the colistin MIC in the log2 scale. Colistin-susceptible revertants were obtained from three P. aeruginosa strains and one strain each of A. baumannii and E. coli resistant mutants. Dashed lines indicate the breakpoint of colistin resistance for each species.