Numerous novel anaerobic bacteria were isolated from the crevicular spaces of dogs with periodontitis. The phenotypic characteristics of these bacterial isolates indicated that they were similar to members of the genus . However, comparison of the 16S rRNA gene sequences of the isolates indicated that they were related to members of the subgroup. A representative of the novel isolates, strain B106, induced alveolar bone loss in a mouse model of experimental periodontal disease. Based on biochemical, morphological, molecular phylogenetic, and pathogenic evidence, it is proposed that the taxonomic subgroup containing these novel isolates and should be classified in a new genus, gen. nov., within the family ‘’. In addition, it is proposed that should be reclassified as comb. nov., and that the newly identified isolates should be classified as representing sp. nov., the type strain of which is B106 (=ATCC PTA-3625=CNCM I-3225).


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