Table 1.

MICs of colistin and colistin methanesulfonate againstP. aeruginosa isolates from CF patients

Mucoid statusSusceptibility patternNo.of strainsColistin formMIC (mg/liter)
RangeGeometric mean
All strainsa Susceptible13Sulfate1–43.1
Na methanesulfonate4–167.1
Resistant11Sulfate>128>128
Na methanesulfonate>128>128
MucoidSusceptible5Sulfate1–42.8
Na methanesulfonate4–85.6
Nonmucoida Susceptible8Sulfate1–43.3
Na methanesulfonate4–168.0
  • a Includes type strain ATCC 27853.