TABLE 5.

Effects of Fe3+ on colistin susceptibility in LB

StrainBroth microdilution colistin MIC (μg/ml)% Survival following 1-h colistin challengea
0 mM FeCl31 mM FeCl30 mM FeCl31 mM FeCl3
AB00570.250.51.6 ± 0.216 ± 8
ATCC 179780.250.50.2 ± 0.456 ± 65
MAC2030.540.1 ± 0.0515 ± 10
MAC20116128NDND
P. aeruginosa ATCC 278530.250.25NDND
  • a Values are means for at least two independent cultures ± standard deviations. ND, not done.