Figure 5.

Inhibition by quercetin (75 µM) of sheep erythrocyte lysis induced by S. aureus NCTC 5655. 1—hemolysis in the absence of bacterial cells; 2, 3 and 4—hemolysis in the presence of bacterial cells in the medium; 2—hemolysis in the presence of quercetin; 3—hemolysis of erythrocytes washed after preliminary incubation with quercetin; 4—hemolysis induced by S. aureus NCTC 5655 in the absence of quercetin. The experimental conditions were similar to those shown in Figure 4. *—p < 0.05 in comparison with erythrocytes exposed to bacteria in the absence of flavonoids.