Fig. 1

Biofilm forming potential in ocular E. coli L-1216/2010 as monitored by scanning electron microscopy after 24 (a), 48 (b) and 72 (c) h of biofilm growth and by confocal scanning laser microscopy after 24 (d), 48 (e) and 72 (f) h of biofilm growth. In d–f, the biofilm was stained with Syto9. The Z axis indicates the thickness of the biofilm which is 5.30, 8.10 and 15.01 μm after 24, 48 and 72 h of biofilm growth. g Represents the susceptibility of ocular E. coli L-1216/2010 in the biofilm phase, h represents the susceptibility of ocular E. coli L-1216/2010 in the planktonic phase and i represents the susceptibility of non-biofilm forming E. coli L-1339/2013 to different concentrations of antibiotics