FIG 4.

Analysis of growth of WT and mutant C. jejuni strains. C. jejuni strains were grown in MH broth alone (A) or in MH broth containing 40 μM Fe₂SO₄ to simulate high iron levels (B) or 20 μM deferoxamine mesylate (DFO), an iron chelator, to simulate iron-depleted conditions (C). Strains were grown under microaerobic conditions at 37°C for 32 to 56 h. All strains were analyzed in triplicate, and the data are presented as average OD₆₀₀ readings for strains at each time point. Error bars indicate standard deviations. Asterisks indicate data points for the mutants that are statistically significantly (P < 0.05) different from those of the WT strain.