Sub-MIC CF-301 inhibits agglutination of S. aureus. (A) Quantitative measure of agglutination after 1-h exposures to sub-MIC CF-301 (MIC values shown) and addition of 50 μg/ml fibrinogen for 15 or 60 min. (B) Visualization of tube agglutination over 60 min; control, no fibrinogen (Fn) added. (C) Scanning electron micrographs of agglutination in human plasma after 1-h exposures to sub-MIC CF-301 (MIC values shown); control, no CF-301 added. Scale bars, 5 μm (×5,000 magnification images) and 1 μm (×20,000 magnification images).