Abstract
This review deals mainly with the taxonomy of the genera and species in the family Bacteroidaceae. It has been proposed that the genus Bacteroides should be restricted to include the "Bacteroides fragilis group" and that the asaccharolytic black-pigmented Bacteroides species be transferred to a new genus, Porphyromonas. New Bacteroides, Fusobacterium, and Selenomonas species have been described. A high degree of heterogeneity is apparently present among Peptostreptococcus species. Mobiluncus is a novel genus including gram-variable curved rods isolated from the human vagina. Brachyspira has been proposed as the generic name for spirochetes isolated from patients with intestinal spirochetosis.
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