Fig. 3
A Proportions of biofilm formation categories among different resistance phenotypes. B A scatter plot of the MAR index and OD580 of each tested isolate indicates the inverse correlation between bacterial resistance and biofilm formation, with a Spearman's correlation coefficient (rs) of -0.703 (P < 0.001). C Biofilm formation capacity among different resistance phenotypes, the Kruskal–Wallis test shows significant differences (P < 0.001). Subsequent pairwise comparisons reveal that non-MDR isolates had significantly higher OD580 compared to MDR isolates (P = 0.002) or XDR isolates (P = 0.002). OD580 is the optical density at 580 nm representing the biofilm density