FIG 3.

Comparison of biofilm index values for five groups. The biofilm index was defined as the average optical density (OD₅₇₀). Boxplots show the medians (horizontal lines) and the 10th, 25th, 75th, and 90th percentiles (boxes and whiskers). ●, outliers; ⭑, extreme values. The numbers in the five groups were as follows: CG200, 29 strains; CG40, 49 strains; CG3570, 16 strains; CG34, 10 strains; CG131, 35 strains. The average biofilm index for EAEC 042, which was used as the positive control, was 3.61.