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Effect of the tryptic soy broth (TSB), Gram-negative (GN), and MacConkey (MAC) broths for E. coli (STEC) enrichment in the absence ((A), n = 52 isolates) or presence ((B), n = 25 isolates) of stool. Bars represent the CFU/mL calculated from serial dilutions on blood agar plates (A) or CHROMagarTM (B). Error bars represent the standard error of the mean. * Indicates growth is significant; ANOVA p ≤ 0.05.
