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| The same Blood Agar plate examined with transmitted light. The colonies are surrounded by a green zone. 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 in pairs or chains of moderate length. Catalase- and oxidase-negative. Attacks sugars by fermentation. Non-motile. |
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