Figure 3.

Relationship between biofilm formation and the resistance of A. baumannii isolates to each of the nine antimicrobial categories. OD₅₅₀, optical density at 550 nm, represents biofilm forming capacity. (A–G): For aminoglycosides, carbapenems, fluoroquinolones, penicillins + β-lactamase inhibitors, folate pathway inhibitors, tetracyclines, and penicillins, susceptible isolates tended to form stronger biofilms (higher OD₅₅₀ values) than non-susceptible ones. (H,I): For cephems and lipopeptides, no significant difference in biofilm formation among susceptible and non-susceptible isolates was observed.