Fig. 3.

CspC and CspE contribute to stress resistance. (A) Growth of the indicated Salmonella strains on LB agar plates after a 2-h challenge with H₂O₂ (2 mM final concentration) (Upper) or after mock treatment (Lower). The ∆dps strain was used as a positive control for sensitivity to oxidative stress. (B) Growth of Salmonella in liquid LB medium supplemented with 3% bile salts as determined by measuring the OD at 600 nm. (C) Survival of Salmonella grown in LB medium after a 1-h challenge with polymyxin B (4 µg/mL final concentration) as determined by counting cfus (**P < 0.001). In B and C, the ∆phoP strain was used as a positive control for sensitivity to membrane stress. Data points refer to the mean of three independent experiments and error bars indicate SEs.