Bactericidal activity of 55 mM (▽), 27.5 mM (△), 13.8 mM (□), and 5.5 mM (○ with dashed line) NCT against S. aureus and E. coli in the presence of 10% blood at 37°C. ■ with dashed line, control without oxidant in 10% blood. Values are means ± SEMs of three independent experiments each; detection limit, 100 CFU/ml. *, threshold values for P < 0.05; **, P < 0.01 versus control without test substances. One-way ANOVA and Dunnett's multiple-comparison test.