Species Megasphaera cerevisiae

Name: Megasphaera cerevisiae Engelmann and Weiss 1986

Category, proposed as: species, sp. nov.

Etymology: ce.re.vi’si.ae. L. fem. n. cerevisia, beer; L. gen. fem. n. cerevisiae, of beer

Pronunciation (Latin), gender: me-ga-SP^HA͡E-ra ke-re-WI-si-a͡e, feminine

Type strain: ATCC 43254; DSM 20462; JCM 6130; PAT 1

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB609706 Analyse FASTA

Effective publication: Engelmann U, Weiss N. Megasphaera cerevisiae sp. nov.: a new gram-negative obligately anaerobic coccus isolated from spoiled beer. Syst. Appl. Microbiol. 1985; 6:287-290.

IJSEM list: Anonymous. Validation list no. 20. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1986; 36:354-356.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Notes:
  • 😷 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 = 1. — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 1. — 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 13 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 genus.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683. 🇺🇸

Parent taxon: Megasphaera Rogosa 1971 (Approved Lists 1980)

Assigned by: Engelmann U, Weiss N. Megasphaera cerevisiae sp. nov.: a new gram-negative obligately anaerobic coccus isolated from spoiled beer. Syst. Appl. Microbiol. 1985; 6:287-290.

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Record number: 777745