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| Medium-sized, greyish colonies which cause no alteration of the blood. |
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| General characteristics: Gram-negative rods. Catalase-positive and oxidase-negative. Attacks sugars by fermentation and gas is produced (Salmonella Gallinarum is anaerogenic and Salmonella Pullorum is variable). Motile with the exception of Salmonella Gallinarum and Salmonella Pullorum. |
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