Summary: The biochemical and chemotaxonomic properties of three previously undescribed strains from human dental root canal infections are presented. The strains were obligately anaerobic Gram-negative rods with fimbriae and a thick capsule-like structure. Carbohydrates were not fermented and agglutination tests were negative. The presence of α-galactosidase, α- and β-glucosidase, β--acetylglucosaminidase and β-galactosidase was confirmed. The strains produced acetic and succinic acids as metabolic end products. They contained a peptidoglycan structure based upon -diaminopimelic acid (Aly) and lacked respiratory quinones. The cellular fatty acids were mainly straight-chain saturated and methyl-branched molecules. High interstrain DNA homology was observed and the DNA base compositions were between 56 and 59 mol% G + C. These three strains appear to comprise the nucleus of a new genus of anaerobic, Gram-negative rods from odontogenic infections.


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