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Stx ELISA OD450 scores by EHEC O157 genotypes following uninduced, nalidixic acid-induced, or carbadox-induced growth in broth enrichment culture. Five EHEC O157 strains were tested in each genotype (CG-1, CG-3, BBG-5, and BBG-6). All strains are nalidixic acid resistant. *, significantly different from all the other values (P ≤ 0.05), three-way (growth conditions, nalidixic susceptibility, and genogroup) GLM with a Tukey-Kramer multiple comparison test.
