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A genus of obligately anaerobic, Gram-negative, rod shaped bacteria assigned to the phylum Bacteroidetes. This species is indole negative, hydrolyzes starch, but not gelatin, requires vitamin K and hemin for growth, hemolytic on rabbit\'s blood agar, reduces neutral red and resazurin, produces hydrogen sulfide after 5 days, and does not utilize lactate, threonine or gluconate. P. merdae, also known as Bacteroides merdae, is commensal to the human intestinal tract and is rarely associated with infections.
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