FIGURE 1.

Growth of EHEC wild-type strain (ATCC 43894) and the luxS-deficient mutant strain under different culture conditions. NaCl (A), bile (B), and pH (C) tests were performed using LB broth at 37°C for 24 h. The fold changes were calculated from optical density values measured at 600 nm, and compared to those for the wild-type strain. Error bars indicate the standard deviations. ^∗p ≤ 0.05.