Figure 1.

Colony‐forming units assays of the four APEC strains in the absence or presence of SXT. Colony‐forming units assays of APEC 17, APEC 19, APEC 29, APEC 40, and APEC 17, APEC 19, APEC 29, APEC 40 cultured with 39 μmol/L AI‐2 and with or without SXT: (a) without SXT, (b) with SXT: APEC 17 with 0.25/4.75 μg/ml, APEC 19 with 1/19 μg/ml, APEC 29 with 1/19 μg/ml, APEC 40 with 1/19 μg/ml. The survival rate of the control group without the addition of AI‐2 was designated 100%. The colony counts of the test group cultured with AI‐2 and SXT were compared to that of the control group (without AI‐2). Error bars indicate standard deviations. The results represent a mean of three independent experiments; **p < .01, *p < .05, indicating a difference between SXT alone and SXT + AI‐2