Name: Yersinia ruckeri Ewing et al. 1978 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: ruc’ke.ri. N.L. gen. masc. n. ruckeri, of Rucker, named after R.R. Rucker, who studied the red mouth disease and its etiological agents

Pronunciation (Latin), gender: yer-SI-ni-a RUK-ke-ri, feminine

Type strain: ATCC 29473; CCUG 14190; CDC 2396-61; CIP 82.80; DSM 18506; HAMBI 1298; JCM 15110; JCM 2429; NCTC 12986

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: X75275 Analyse FASTA

Effective publication: Ewing WH, Ross AJ, Brenner DJ, Fanning GR. Yersinia ruckeri sp. nov., the redmouth (RM) bacterium. International Journal of Systematic Bacteriology 1978; 28:37-44.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

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

Risk group: 2

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.03875 (N = 4).
  • 😷 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: 3". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2, note = "PV". — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 1, note = "t2". — The risk group for Taiwan has been imported on 2024-11-03. The full classification is: risk group = 1, 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 522 times in PubMed until 2026-06-11.
  • 🙆 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. 🇬🇧
  • 🧍 Yersinia ruckeri Ewing et al. 1978 (Approved Lists 1980) was previously known as "the red mouth bacterium". Publication: Euzeby JP. List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int J Syst Bacteriol 1997; 47:590-592. 🇫🇷

Parent taxon: Yersinia van Loghem 1944 (Approved Lists 1980)

Assigned by: Ewing WH, Ross AJ, Brenner DJ, Fanning GR. Yersinia ruckeri sp. nov., the redmouth (RM) bacterium. International Journal of Systematic Bacteriology 1978; 28:37-44.

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Record number: 785227