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A species of obligately anaerobic, Gram-negative, rod shaped bacteria assigned to the phylum Bacteroidetes. This species is nonmotile, non-spore forming, nonpigmented, cellobiose, rhamnose, salicin sucrose, lactose, esculin hydrolysis, beta-N-acetyl-glucosaminidase, alpha-fucosidase, beta-glucosidase, and glycine aminopeptidase positive, but xylose, arabinose, indole, and beta-xylosidase negative. P. oralis is part of the normal human oral cavity flora, but is associated with oral and upper respiratory infections.
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