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In vitro interaction between colistin (0.25 to 128 mg/liter) and tigecycline (0.007 to 64 mg/liter) against carbapenem-resistant K. pneumoniae biofilms. The x axis and y axis represent the concentrations of colistin and tigecycline, and the z axis represents the percent ΔE (for additional information, see the Fig. 2 legend). The percent ΔE ± SE was 32.4% ± 6.5% for the colistin-tigecycline combination (synergistic interaction).
