TABLE 4.

Effects of acid pH on colistin susceptibility

StrainBroth microdilution colistin MIC (μg/ml) (MHB)% Survival following 1-h colistin challenge (LB)a
pH 5.5pH 7.7pH 5.5pH 7.7
AB005764170 ± 11<1
ATCC 17978641-275 ± 26<1
MAC1031281NDND
MAC2034168 ± 52<1
AB06010.25NDND
P. aeruginosa ATCC 2785312NDND
  • a Values are means for at least two independent cultures ± standard deviations. ND, not done.