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Initially colonies are small, circular, entire and transparent. Later they become larger, opaque, with a dull, dry and rough surface. The colonies adhere strongly to the agar.
Close-up photograph of same plate |
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The same Blood Agar plate examined with transmitted light. In areas of confluent growth an unspecific lysis of the bloodcells is seen due to enzymatic activity.
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| General characteristics: Gram-positive, long, spore-forming rods, with a diameter < 0.9 µm. Catalase-positive. Attacks sugars fermentatively. Motile. |
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