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| Medium sized grey or bluish colonies. In areas of confluent growth the colonies and agar are dark due to production of the pigments pyoverdin and pyocyanin. |
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| The same Blood Agar plated examined in transmitted light. There is an unspecific lysis of the blood due to emzymatic activity in areas of confluent growth. |
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| General characteristics: Gram-negative, straight or curved rods. Catalase- and oxidase-positive. Attacks sugars by oxidation. Obligately aerobic. Motile. |
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