Figure 1: Syto9 quantification of 3 biofilm forming isolates of S. aureus treated with different concentrations of ethanol or chloramine T. Strong biofilm former (B+++), moderate biofilm former (B++), and weak biofilm former (B+) were treated with increasing concentrations of ethanol (a) or chloramine T (b) and biofilm quantity was determined by Syto9 labeling. Graphs show biofilm levels in samples cultivated with disinfectants versus controls (samples cultivated without disinfectants). Columns represent mean values of fluorescence and vertical bars represent 95% confidence intervals regarding the means.