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Abstract
The name Bacteroides melaninogenicus subsp. macacae is proposed for a subspecies to accommodate strains of gram-negative, anaerobic, catalase-producing rods which produce black colonies on blood agar plates. The organisms weakly ferment galactose, glucose, lactose, and mannose and exhibit no fermentation of 24 other carbohydrates. The metabolic acid end products formed in peptone-yeast extract-glucose broth cultures include acetic, propionic, isobutyric, butyric, isovaleric, and succinic acids. The organisms utilize pyruvate, digest gelatin, and produce indole and hydrogen sulfide. B. melaninogenicus subsp. macacae appears to be serologically distinct from B. asaccharolyticus, B. melaninogenicus subsp. levii, B. melaninogenicus subsp. intermedius, and B. melaninogenicus subsp. melaninogenicus. The type strain of this new subspecies is ATCC 33141.
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