Fig. 2

Inhibition of growth by colistin and colistin degradation in the cultures of S. maltophilia strains. Colistin was added to 12-h cultures at a concentration of 128 mg/L. The number of viable cells was determined as colony-forming units (CFU). Circle, triangle, and square indicate strains Col1 (wild type), Col2 (Δcdp), and Col3 (Δcdp::cdp), respectively. Closed and open symbols indicate viable cell count and concentration of residual colistin in the cultures, respectively