Figure 1.

Biofilm-forming activity of all enterococcal isolates. (A) Boxplots showing the results of the Crystal Violet assay, measured as OD in triplicates. The Y axis represents the actual optical density of each reading, on a log scale. Isolate “EU42” is indicated by an arrow because its interquartile range spans the moderate-strong biofilm-formation threshold, which led to its exclusion from further analysis. (B) Beanplots indicating the distinction of the isolates according to their biofilm assay into weak, moderate, and strong-biofilm formers. Horizontal lines in (A and B) represent the thresholds for biofilm strength classification (Table 1): brick red (threshold for “strong” designation; dark green: threshold for “moderate” designation; gray: threshold for “weak” designation. (C) Pie chart for the proportion of isolates with different strengths of biofilm formation.