Species Megasphaera elsdenii

Name: Megasphaera elsdenii (Gutiérrez et al. 1959) Rogosa 1971 (Approved Lists 1980)

Category, proposed as: species, comb. nov.

Basonym: "Peptostreptococcus elsdenii" Gutiérrez et al. 1959

Etymology: els.de’ni.i. N.L. gen. masc. n. elsdenii, of Elsden, named after S.R. Elsden who first isolated the organism

Pronunciation (Latin), gender: me-ga-SP^HA͡E-ra els-DE-ni-i, feminine

Type strain: ATCC 25940; CCUG 6199; CIP 106852; DSM 20460; JCM 1772

Conduct genome-based taxonomy at

16S rRNA gene: AB609704 Analyse FASTA

Effective publication: Rogosa M. Transfer of Peptostreptococcus elsdenii Gutierrez et al. to a new genus, Megasphaera [M. elsdenii (Gutierrez et al) comb. nov.]. International Journal of Systematic Bacteriology 1971; 21:187-189.

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
    "Peptostreptococcus elsdenii" Gutiérrez et al. 1959	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 🥇 Nomenclatural type of the genus Megasphaera Rogosa 1971 (Approved Lists 1980). Publication: Rogosa M. Transfer of Peptostreptococcus elsdenii Gutierrez et al. to a new genus, Megasphaera [M. elsdenii (Gutierrez et al) comb. nov.]. International Journal of Systematic Bacteriology 1971; 21:187-189.
  • 😷 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 2026-08-13. The full classification is: risk group = 1, 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 381 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. 🇬🇧

Parent taxon: Megasphaera Rogosa 1971 (Approved Lists 1980)

Assigned by: Rogosa M. Transfer of Peptostreptococcus elsdenii Gutierrez et al. to a new genus, Megasphaera [M. elsdenii (Gutierrez et al) comb. nov.]. International Journal of Systematic Bacteriology 1971; 21:187-189.

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Record number: 777746