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A species of anaerobic, Gram-negative, rod shaped bacteria assigned to the phylum Bacteroidetes. This species is non-motile, non-spore-forming, produces a tan to buff pigment on blood agar, fluoresces under UV (365 nm) light, sucrose, lactose, and beta-N-acetyl-glucosaminidase positive, but xylose arabinose, cellobiose, rhamnose, salicin, indole, esculin hydrolysis beta-glucosidase, and glycine aminopeptidase negative. P. melaninogenica is part of the normal human oral and vaginal flora, but can also be an opportunistic pathogen causing infections in both humans and animals.
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