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Pinpoint to small, semi-transparent colonies.
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| The same Blood Agar plate examined with transmitted light. The colonies are surrounded by a narrow haemolytic zone. This zone is more easily seen if the culture is grown on thin Blood Agar plates. |
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| General characteristics: Gram-positive rods. Catalase-positive. Attacks sugars fermentatively. Motile with characteristic slow, tumbling and rotary movements. |
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