Name: Morganella morganii (Winslow et al. 1919) Fulton 1943 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Bacillus morgani" Winslow et al. 1919

Etymology: mor.ga’ni.i. N.L. gen. masc. n. morganii, of Morgan, named after H. de R. Morgan, a British bacteriologist who first studied the organism

Pronunciation, gender: mor-GA-ni-i, feminine

Type strain: ATCC 25830; ATCC 8076-H; CCUG 6328; CIP 103763; CIP A231; DSM 30164; IFO 3848; JCM 1672; LMG 7874; NBIMCC 1392; NBRC 3848; NCCB 73065; NCTC 235

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AJ301681 Analyse FASTA

Effective publication: Fulton M. The Identity of Bacterium Columbensis Castellani. J Bacteriol 1943; 46:79-82.

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

• Synonyms:

  • Name	Kind
    Proteus morganii (Winslow et al. 1919) Yale 1939 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    "Bacillus morgani" Winslow et al. 1919	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 🥇 Nomenclatural type of the genus Morganella Fulton 1943 (Approved Lists 1980). Publication: Fulton M. The Identity of Bacterium Columbensis Castellani. J Bacteriol 1943; 46:79-82.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human and 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: 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 Sweden has been imported on 2024-02-05. 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 1139 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.
  • 🧍 Morganella morganii (Winslow et al. 1919) Fulton 1943 (Approved Lists 1980) and Proteus morganii (Winslow et al. 1919) Yale 1939 (Approved Lists 1980) have the same type strain and therefore are homotypic synonyms [Rules 24a and 24b (1)]. — Subsequently, this species has been divided into subspecies (see: below). Publication: Yale MW. Genus VI. Proteus Hauser. In: Bergey DH, Breed RS, Murray EGD, Hitchens AP (eds), Bergey's Manual of Determinative Bacteriology, 5th ed., The Williams & Wilkins Co, Baltimore, 1939, p. 430-436.
  • 🧍 On the Approved Lists of Bacterial Names, this nomenclatural name is incorrectly cited as Morganella morganii (Winslow et al. 1919) Brenner et al. 1978 (sic). Publication: Hill LR, Skerman VBD, Sneath PHA. Corrigenda to the Approved Lists of Bacterial Names edited for the International Committee on Systematic Bacteriology. Int. J. Syst. Bacteriol. 1984; 34:508-511.

Subdivision:

Number of child taxa with a validly published and correct name: 2
Number of child taxa with a validly published name, including synonyms: 2
Total number of child taxa: 2

• Child taxa:

  • Name	Nomenclatural status	Taxonomic status
    Morganella morganii subsp. morganii (Winslow et al. 1919) Jensen et al. 1992	validly published under the ICNP	correct name
    Morganella morganii subsp. sibonii Jensen et al. 1992	validly published under the ICNP	correct name

Parent taxon: Morganella Fulton 1943 (Approved Lists 1980)

Assigned by: Fulton M. The Identity of Bacterium Columbensis Castellani. J Bacteriol 1943; 46:79-82.

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Record number: 778330