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Two strains of Staphylococcus aureus on Tryptic Soy Agar. Cultivation 24 hours, aerobic atmosphere, 37°C.
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Yellow color of colonies of Staphylococcus aureus is caused by a a golden coloured carotenoid pigment staphyloxanthin. This pigment acts as a virulence factor so generally you can consider yellow pigmented strains to be more virulent.
Text: Wikipedia
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