Staphylococcus aureus
| Interpretation | All are Staphylococcus aureus. It develops blue to light blue. |
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Staphylococcus epidermidis
| Interpretation | Black to gray colonies are not Staphylococcus aureus. |
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Bacillus
| Interpretation | Black to gray colonies are not Staphylococcus aureus. Highly motility microorganisms such as Bacillus may form spreading black to gray colonies. |
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Mixture of Staphylococcus aureus and non-Staphylococcus aureus
| Interpretation | Blue to light blue colonies are Staphylococcus aureus. In rare cases, non-Staphylococcus aureus may grow with black to gray colonies without blue to light blue color. |
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