Bacteroides oris and , two new species isolated from periodontal pockets and the superficially cleaned tooth surface coronal to the gingival margin, from various types of human infections, and from chicken intestinal contents are described. They were obligately anaerobic, gram-negative, nonpigmenting, nonmotile, non-spore-forming rods that did not grow well in 10% bile and that fermented carbohydrates. Although we had previously identified many of these strains as members of subsp. biovar (biotype) 3 (Holdeman et al. [ed.], , 4th ed., 1977), in the present study, we found that the strains had no deoxyribonucleic acid homology with the type strains of subsp. or subsp. . The strains also had no deoxyribonucleic acid homology with the type strain of . ATCC 27518, which we deposited as representative of human isolates of subsp. biovar 3, is now identified as a strain of . The type strains of and are ATCC 33573 and ATCC 33574, respectively.


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