FIG 2 .
Biofilm formation by S. aureus strains FPR3757 (USA300) and 11490 (USA500) in the presence of sub-MICs of methicillin. (A) Photographs of crystal violet-stained microtiter plate wells. Duplicate wells are shown. (B) Average biofilm CFU/well values for biofilms cultured in 0 or 2 µg/ml methicillin. Error bars indicate ranges. Values that were significantly different (P < 0.05) from those of the no-methicillin control are indicated by an asterisk.