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Pinpoint to small, white colonies.
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| The same Blood Agar plate examined with transmitted light. There is a narrow green zone around the colonies. This 'greening' is caused by the accumulation of hydrogen peroxide converting the haemoglobin to methaemoglobin in the agar. |
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| General characteristics: Gram-positive cocci. Catalase-negative. Attacks sugars fermentatively. Microaerophilic. Non-motile. |
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