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Staphylococcus aureus, Tryptic Soy Agar. Cultivation 24 hours, aerobic atmosphere, 37°C.
This strain is without typical yellow pigmentation.
Non-pigmented strains of S. aureus are less likely to survive incubation with an oxidizing chemical, such as hydrogen peroxide than pigmented strains. Mutant colonies are quickly killed when exposed to human neutrophils, while many of the pigmented colonies survive. In mice, the pigmented strains cause lingering abscesses when inoculated into wounds, whereas wounds infected with the unpigmented strains quickly heal.
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