Name: Bilophila wadsworthia Baron et al. 1990

Category: Species

Proposed as: sp. nov.

Etymology: wads.wor’thi.a. N.L. fem. adj. wadsworthia, belonging to Wadsworth, originating from the Wadsworth Anaerobe Laboratories of the Wadsworth Veterans Administration Medical Center

Pronunciation (Latin), gender: … wads-WOR-t^hi-a, feminine

Type strain: 7959; ATCC 49260; CCUG 32349; WAL 7959

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: KU749296 Analyse FASTA

Effective publication: Baron EJ, Summanen P, Downes J, Roberts MC, Wexler H, Finegold SM. Bilophila wadsworthia, gen. nov. and sp. nov., a unique gram-negative anaerobic rod recovered from appendicitis specimens and human faeces. J Gen Microbiol 1989; 135:3405-3411. 🇺🇸

IJSEM list: Anonymous. Validation list no. 34. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1990; 40:320-321.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 2

• Notes:
  • 🥇 Nomenclatural type of the genus Bilophila Baron et al. 1990. Publication: Baron EJ, Summanen P, Downes J, Roberts MC, Wexler H, Finegold SM. Bilophila wadsworthia, gen. nov. and sp. nov., a unique gram-negative anaerobic rod recovered from appendicitis specimens and human faeces. J Gen Microbiol 1989; 135:3405-3411. 🇺🇸
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2, note = "ht". — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 169 times in PubMed until 2025-06-04.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.
  • 🧍 According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology (Reading) 2022; 168:0. 🇬🇧
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683. 🇺🇸
  • 🧍 According to a recent investigation, the previously listed 16S rRNA sequence (accession number AJ867049) for the type strain does not appear to belong to the type strain. Type strain CCUG 32349 was acquired, sequenced and deposited in GenBank under accession number KU749296; this sequence has a very high degree of identity with the earliest deposit (L35148) and will be used hereafter in LPSN. — Bernard K. Personal communication, 2016-08-15.

Parent taxon: Bilophila Baron et al. 1990

Assigned by: Baron EJ, Summanen P, Downes J, Roberts MC, Wexler H, Finegold SM. Bilophila wadsworthia, gen. nov. and sp. nov., a unique gram-negative anaerobic rod recovered from appendicitis specimens and human faeces. J Gen Microbiol 1989; 135:3405-3411. 🇺🇸

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Record number: 774065