FIG. 2.

Comparison of biofilm environmental regulation in S. aureus strains BH1CC, BH1CC Δica::tet, RN4220, and RN4220 Δica::tet. (A) Biofilm formation by S. aureus BH1CC and BH1CC Δica::tet in BHI medium or in BHI medium supplemented with 4% NaCl or 1% glucose. (B) Biofilm formation by S. aureus RN4220 and RN4220 Δica::tet in BHI medium or in BHI medium supplemented with 4% NaCl or 1% glucose. Biofilm values are OD₄₉₂ readings after staining with crystal violet and are the means of at least six independent assays. Standard deviations were less that 25% (data not shown). Gluc, glucose.