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Pinpoint, semi-transparent colonies. This culture has been incubated for 48 hours in a micro-aerobic atmosphere.
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| The same Blood Agar plate examined with transmitted light. Absence of 'greening' around the colonies is due to the production of pseudocatalase which prevents the accumulation of hydrogen peroxide. |
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| General characteristics: Gram-positive cocci. Catalase-negative, but may show a catalase-positive reaction when grown on Blood Agar. Attacks sugars fermentatively and no gas is produced. Microaerophilic. Non-motile. |
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