Figure 2. Effects of the lyophilized cell-free supernatants (LCFS) of Lactobacillus on the inhibition of the established biofilms of A. baumannii (A) and E. coli (B).

The bacteria were grown in a medium supplemented with glucose to produce established biofilms. The established biofilms were treated with LCFS of Lactobacillus at different concentrations. Cell-free supernatant-free medium was used as the negative control. The relative percentage of biofilm eradication was defined as follows: [100 − (mean A570 of treated well/mean A570 of control well) × 100]. The percent inhibition of each datum was compared with its negative control. The data are presented as mean ± standard deviation (* significant difference; P < 0.05).