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Long-term survival of E. coli O157:H7 (strain P1432) in TPB at pH 3.0. Prior to acid challenge, cultures were grown in TPB (pH 7.0) at 30°C to mid-exponential phase (triangles, nonadapted; squares, adapted at pH 5.0 for 1 h prior to challenge) or stationary phase (circles). The error bars represent the standard deviations from the means (n = 3).
