Bacteroides faecium sp. nov. isolated from human faeces

Juseok Kim, Hye Seon Song, Joon Yong Kim, Tae Woong Whon, Won Hyong Chung, Young Do Nam, Yoon E. Choi, Seong Woon Roh

Research output: Contribution to journalArticlepeer-review


A novel bacterial strain, CBA7301T, was isolated from human faeces and was characterised using a polyphasic taxonomic approach. A phylogenetic analysis based on 16S rRNA gene sequences revealed that CBA7301T represented a member of the genus Bacteroides, in the family Bacteroidaceae. The similarity between the 16S rRNA gene sequence of CBA7301T and that of its most closely related species, Bacteroides faecichinchillae JCM 17102T, was 96.2 %, and the average nucleotide identity between these two strains was 77.9 %. The genome size was 6 782 182 bp, and the DNA G+C content was 42.5 mol%. Cells of CBA7301T were Gram-stain-negative, strictly anaerobic and rod-shaped. The optimal growth of this organism occurred at 30–35 °C, pH 7.0 and 0.5 % (w/v) NaCl. The respiratory quinone was menaquinone 10. The predominant polar lipids were phosphatidylethan-olamine, phospholipids and aminophospholipids. The major cellular fatty acid was anteiso-C15: 0. According to the results of the polyphasic taxonomic analysis, CBA7301T represents a novel species of the genus Bacteroides, which we named Bacteroides faecium sp. nov. The type strain is CBA7301T (=KCCM 43355T=ATCC TSD-227T).

Original languageEnglish
Article number005666
JournalInternational Journal of Systematic and Evolutionary Microbiology
Issue number1
Publication statusPublished - 2023 Jan 1

Bibliographical note

Funding Information:
This research was supported by the Main Research Program of the Korea Food Research Institute (E0170600-06) and the World Institute of Kimchi (KE2202-1-1) funded by the Ministry of Science and ICT; the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2018M3A9F3055925 and 2019R1A2C2087449), Republic of Korea.

Publisher Copyright:
© 2023 The Authors.


  • Bacteroides
  • bacterial taxonomy
  • bacteroides faecium
  • human faeces

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics


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