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

Category: Species

Proposed as: comb. nov.

Basonym: "Peptostreptococcus elsdenii" Gutierrez et al. 1959

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

Gender: feminine

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

See detailed strain information at

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

Risk group: 2

• Synonyms:

  • Name	Kind
    "Peptostreptococcus elsdenii" Gutierrez 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 2023-10-29. 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 332 times in PubMed until 2024-03-27.
  • 🧍 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 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