Killing of S. aureus by H2O2. Survival of lysogenic (COL, Mu50, FRI-S6, RF122, LUG855, and RN10359) or nonlysogenic (V329, RN450) S. aureus strains in media supplemented with hydrogen peroxide at a concentration of 0.5 mM, and unsupplemented medium (control). Values represent the average of 3 independent experiments. Variation was within ± 5% in all cases.