Fig 1. Biofilm formation and growth of 40 carbapenem-resistant A. baumannii ST191 isolates.

(A) Bacteria were cultured in 5 ml polystyrene tubes for 24 h at 30°C. Biofilm formation was quantified by calculating the ratio of OD₅₇₀/OD₆₀₀. Data are presented as the mean ± standard deviation of three independent experiments, each performed in triplicate. (B) Bacteria were cultured in 5 ml polystyrene tubes for 24 h at 30°C with or without shaking. Optical density at 600 nm was determined in each time point. Data are presented as the mean value of two independent experiments.