Name: Koserella trabulsii Hickman-Brenner et al. 1985

Category: Species

Proposed as: sp. nov.

Etymology: tra.bul’si.i. N.L. gen. masc. n. trabulsii, of Trabulsi named after L. R. Trabulsi, a Brazilian bacteriologist for his contributions to enteric bacteriology, particularly his studies on the genera Salmonella and Shigella and on diarrhea-causing Escherichia coli in Brazil

Pronunciation, gender: tra-BUL-si-i, feminine

Type strain: ATCC 35313; CDC 3349-72

Conduct genome-based taxonomy at

16S rRNA gene: HF558367 Analyse FASTA

Effective publication: Hickman-Brenner FW, Huntley-Carter GP, Fanning GR, Brenner DJ, Farmer JJ. Koserella trabulsii, a new genus and species of Enterobacteriaceae formerly known as Enteric Group 45. J Clin Microbiol 1985; 21:39-42.

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: synonym (and not recommended for medical use)

Correct name: Yokenella regensburgei Kosako et al. 1985

Risk group: 2

• Synonyms:

  • Name	Kind
    Yokenella regensburgei Kosako et al. 1985	heterotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Koserella Hickman-Brenner et al. 1985. Publication: Hickman-Brenner FW, Huntley-Carter GP, Fanning GR, Brenner DJ, Farmer JJ. Koserella trabulsii, a new genus and species of Enterobacteriaceae formerly known as Enteric Group 45. J Clin Microbiol 1985; 21:39-42.
  • ⏲ According to Kosako et al. (1987), this species is a later heterotypic synonym of Yokenella regensburgei Kosako 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.
  • ❗ Koserella trabulsii is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Koserella.
  • 😷 The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No". — 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 8 times in PubMed until 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.
  • 🧍 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.

Parent taxon: Koserella Hickman-Brenner et al. 1985

Assigned by: Hickman-Brenner FW, Huntley-Carter GP, Fanning GR, Brenner DJ, Farmer JJ. Koserella trabulsii, a new genus and species of Enterobacteriaceae formerly known as Enteric Group 45. J Clin Microbiol 1985; 21:39-42.

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Record number: 777203