Confocal Laser Scanning Microscopy analysis evidenced the high biofilm forming ability of E. faecalis SK460 (Fig. 1). The 24 h old biofilm showed an average thickness of approximately 40 μm. Fig. 1 Confocal laser scanning microscopy images of biofilm formation of E. faecalis SK460 at 12 h and 24 h. The images are processed using NIS-Element AR software, version 4.00.04