Fig. 2From: Zinc oxide nanoparticles reduce biofilm formation, synergize antibiotics action and attenuate Staphylococcus aureus virulence in host; an important message to cliniciansQuantitative assessment of S. aureus isolates biofilm formation. Bacterial biofilms were quantified by crystal violet assay. Optical density (OD) was measured spectrophotometrically at 570Â nm. S. aureus isolates were classified according to biofilm forming capacity into strong, moderate, weak and non-biofilm formingBack to article page