Figure 4 (A, B) Relative expression of biofilm synthesis gene bfs in clinically isolated Acinetobacter baumannii strainsGene expression relative to that of rpoB was determined by RT-PCR. Each isolate was tested in triplicate in 2 independent experiments – white bars, TS-AN (sensitive) isolates; black bars, TR-AN (resistant) isolates. The bars represent the average, and the error bars represent the standard deviations. Data were analyzed using an independent t test (* P<0.05, ** P<0.01).