Bacteroides faecis sp. nov., isolated from human faeces

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  • Min-Soo Kim
    University of Science & Technology, Biological Resources Center, KRIBB, Daejeon 305-806, Republic of Korea
  • Seong Woon Roh
    University of Science & Technology, Biological Resources Center, KRIBB, Daejeon 305-806, Republic of Korea
  • Jin-Woo Bae
    University of Science & Technology, Biological Resources Center, KRIBB, Daejeon 305-806, Republic of Korea

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<jats:p>Two anaerobic, Gram-negative, non-motile and non-spore-forming bacterial strains, designated MAJ27<jats:sup>T</jats:sup> and MAJ26, were isolated from human faeces. Both isolates grew optimally at 37 °C, were oxidase- and catalase-negative, were sensitive to bile and produced acid from fermentation of several substrates, including glucose. A study based on 16S rRNA gene sequences showed that both isolates were closely related to type strains of species of the genus <jats:italic>Bacteroides</jats:italic>. Comparisons of the isolates with <jats:italic>Bacteroides thetaiotaomicron</jats:italic> VPI 5482<jats:sup>T</jats:sup> and <jats:italic>Bacteroides</jats:italic> <jats:italic>finegoldii</jats:italic> JCM 13345<jats:sup>T</jats:sup> showed high levels of 16S rRNA gene sequence similarity (98.6–98.7 and 96.9–97.0 %, respectively), but low levels of DNA–DNA relatedness (≤22 %). The DNA G+C content (42.7±1 mol%) and the major fatty acid (anteiso-C<jats:sub>15 : 0</jats:sub>, 39.3–42.5 %) supported the assignment of the isolates to the genus <jats:italic>Bacteroides</jats:italic>. Based on phenotypic, chemotaxonomic, genotypic and phylogenetic studies, we propose that strains MAJ27<jats:sup>T</jats:sup> and MAJ26 be classified as representing a novel species, <jats:italic>Bacteroides faecis</jats:italic> sp. nov. The type strain is MAJ27<jats:sup>T</jats:sup> (=KCTC 5823<jats:sup>T</jats:sup>=JCM 16478<jats:sup>T</jats:sup>).</jats:p>

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