Name: Yokenella regensburgei Kosako et al. 1985

Category: Species

Proposed as: sp. nov.

Etymology: re.gens.bur’ge.i. N.L. gen. neut. n. regensburgei, of Regensburg, Germany, where the type strain of Yokenella regensburgei and five other strains in the original paper (Kosako et al., 1984) were isolated from insects

Pronunciation, gender: re-gens-BUR-ge-i, feminine

Type strain: ATCC 49455; BCRC 12225; CCRC 12225; CIP 105435; JCM 2403; NBRC 102600; NCTC 11966; NIH 725-83

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: JN175339 Analyse FASTA

Effective publication: Kosako Y, Sakazaki R, Yoshizaki E. Yokenella regensburgei gen. nov., sp. nov.: a new genus and species in the family Enterobacteriaceae. Jpn J Med Sci Biol 1984; 37:117-124. 🇯🇵

IJSEM list: Anonymous. Validation list no. 17. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1985; 35:223-225.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Synonyms:

  • Name	Kind
    Koserella trabulsii Hickman-Brenner et al. 1985	heterotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Yokenella Kosako et al. 1985. Publication: Kosako Y, Sakazaki R, Yoshizaki E. Yokenella regensburgei gen. nov., sp. nov.: a new genus and species in the family Enterobacteriaceae. Jpn J Med Sci Biol 1984; 37:117-124. 🇯🇵
  • ⏰ According to Kosako et al. (1987), this species is an earlier heterotypic synonym of Koserella trabulsii Hickman-Brenner et al. 1985. Publication: Kosako Y, Sakazaki R, Huntley-Carter GP, Farmer Iii JJ. Yokenella regensburgei and Koserella trabulsii are subjective synonyms. Int. J. Syst. Bacteriol. 1987; 37:127-129. 🇯🇵
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 2, note = "Animal classification RG: 1 - 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. — The risk group for Taiwan has been imported on 2024-11-03. The full classification is: risk group = 2, note = "P650 = v". — 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 30 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. 🇬🇧
  • 🧍 This name was subject to a comment on a Request for an Opinion. Publication: Li MS. On the priority between Yokenella regensburgei Kosako et al. 1985 and Koserella trabulsii Hickman-Brenner et al. 1985 and on the priority between Providencia alcalifaciens (de Salles Gomes 1944) Ewing 1962 (Approved Lists 1980) and Proteus inconstans (Ornstein 1920) Shaw and Clarke 1955 (Approved Lists 1980). Requests for an Opinion. Int J Syst Evol Microbiol 2025; 75:6746. 🇹🇼
  • 🧍 Priority: IJSB 41:171. Publication: Kosako Y, Sakazaki R. Priority of Yokenella regensburgei Kosako, Sakazaki, and Yoshizaki 1985 over Koserella trabulsii Hickman-Brenner, Huntley-Carter, Brenner, and Farmer 1985. Int. J. Syst. Bacteriol. 1991; 41:171. 🇯🇵
  • 🧍 See also: Publication: Wayne LG. JUDICIAL COMMISSION: Minutes of the Meeting, 14 September 1990, Osaka, Japan. Int. J. Syst. Bacteriol. 1991; 41:185-187.

Parent taxon: Yokenella Kosako et al. 1985

Assigned by: Kosako Y, Sakazaki R, Yoshizaki E. Yokenella regensburgei gen. nov., sp. nov.: a new genus and species in the family Enterobacteriaceae. Jpn J Med Sci Biol 1984; 37:117-124. 🇯🇵

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Record number: 783205