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Effect of growth conditions on stress resistance of wild-type L. pneumophila. Exponential-phase (Exp), stationary-phase (Stat), or Ers-treated stationary-phase (Ers) cultures or bacteria recovered from A. castellanii following intracellular multiplication (Acca) were challenged with pH 3 (A) or 1 mM H2O2 (B) and titrated after different times (mean ± standard deviation). The points plotted on the x axis are the values when there were no CFU.
