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Bacteroides dorei sp. nov., isolated from human faeces

¹ Microbe Division/Japan Collection of Microorganisms, RIKEN BioResource Center, Wako, Saitama 351-0198, Japan
² Laboratory of Dairy Science and Technology, Kyodo Milk Industry Co. Ltd, Hinode, Tokyo 190-0182, Japan

Correspondence
Mitsuo Sakamoto
sakamoto{at}jcm.riken.jp

Two Gram-negative, anaerobic, non-spore-forming rod-shaped organisms were isolated from human faeces. These isolates were tentatively identified as Bacteroides based on morphological and biochemical criteria and appeared closely related to Bacteroides vulgatus ATCC 8482^T. The 16S rRNA gene sequence analysis showed that the isolates were highly related to each other (99.5 %) and confirmed their placement in the genus Bacteroides. 16S rRNA gene sequence similarity values with close phylogenetic neighbours Bacteroides vulgatus ATCC 8482^T (96 %) and Bacteroides massiliensis CCUG 48901^T (93 %) preliminarily demonstrated that the organisms represented a novel species. The results of phenotypic, chemotaxonomic and 16S rRNA gene sequence analyses, and DNA–DNA homology values provided evidence that these two unknown isolates represent a single species and should be assigned to a novel species of the genus Bacteroides, as Bacteroides dorei sp. nov. The type strain is JCM 13471^T (=DSM 17855^T).

Tables showing biochemical properties, fatty acid composition, DNA base composition and DNA–DNA hybridization values of Bacteroides dorei sp. nov. and closely related Bacteroides species, and figures showing maximum-parsimony and UPGMA trees are available as supplementary material in IJSEM Online.

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