Name: Porphyromonas levii (Johnson and Holdeman 1983 ex Holdeman et al. 1977) Shah et al. 1995

Category: Species

Proposed as: comb. nov.

Basonym: Bacteroides levii (ex Holdeman et al. 1977) Johnson and Holdeman 1983

Etymology: le’vi.i. N.L. gen. masc. n. levii, of Lev, named after Meir Lev, the American-English microbiologist, who first isolated this organism

Pronunciation (Latin), gender: … LE-wi-i, feminine

Type strain: ATCC 29147; DSM 23370; LEV

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: FJ792536 Analyse FASTA

Valid publication: Shah HN, Collins MD, Olsen I, Paster BJ, Dewhirst FE. Reclassification of Bacteroides levii (Holdeman, Cato, and Moore) in the genus Porphyromonas, as Porphyromonas levii comb. nov. Int. J. Syst. Bacteriol. 1995; 45:586-588. 🇬🇧

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 45, part 3 of the IJSB. Int J Syst Bacteriol 1995; 45:881.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Synonyms:

  • Name	Kind
    Bacteroides levii (ex Holdeman et al. 1977) Johnson and Holdeman 1983	homotypic synonym, validly published under the ICNP

• Emendations:
  • Hahnke et al. 2016 Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.
    Notes:
    • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project.

• Notes:
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 1, note = "animal pathogen - biological class of risk animal: 2". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 2 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — 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 36 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. 🇬🇧

Parent taxon: Porphyromonas Shah and Collins 1988

Assigned by: Shah HN, Collins MD, Olsen I, Paster BJ, Dewhirst FE. Reclassification of Bacteroides levii (Holdeman, Cato, and Moore) in the genus Porphyromonas, as Porphyromonas levii comb. nov. Int. J. Syst. Bacteriol. 1995; 45:586-588. 🇬🇧

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Record number: 784669