Species Peptostreptococcus ivorii

Name: Peptostreptococcus ivorii Murdoch et al. 1997

Category, proposed as: species, sp. nov.

Etymology: i.vo’ri.i. N.L. gen. masc. n. ivorii, of Ivor, a British microbiologist who first isolated the organism

Pronunciation (Latin), gender: pep-to-strep-to-KOK-kus i-WO-ri-i, masculine

Type strain: ATCC BAA-602; CCUG 38492; CIP 105325; DSM 10022; NCTC 13078; SBH 093

Conduct genome-based taxonomy at

16S rRNA gene: Y07840 Analyse FASTA

Valid publication: Murdoch DA, Collins MD, Willems A, Hardie JM, Young KA, Magee JT. Description of three new species of the genus Peptostreptococcus from human clinical specimens: Peptostreptococcus harei sp. nov., Peptostreptococcus ivorii sp. nov., and Peptostreptococcus octavius sp. nov. Int. J. Syst. Bacteriol. 1997; 47:781-787. 🇬🇧

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 47, part 3 of the IJSB. Int J Syst Bacteriol 1997; 47:1275-1276.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Peptoniphilus ivorii (Murdoch et al. 1997) Ezaki et al. 2001

Risk group: 2

• Synonyms:

  • Name	Kind
    Aedoeadaptatus ivorii (Murdoch et al. 1997) Malhotra et al. 2024	homotypic synonym, validly published under the ICNP
    Peptoniphilus ivorii (Murdoch et al. 1997) Ezaki et al. 2001	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Peptostreptococcus ivorii is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Peptostreptococcus.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human pathogen". — 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 = 2. — 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 1 time in PubMed until 2026-06-11.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of 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: Peptostreptococcus Kluyver and van Niel 1936 (Approved Lists 1980)

Assigned by: Murdoch DA, Collins MD, Willems A, Hardie JM, Young KA, Magee JT. Description of three new species of the genus Peptostreptococcus from human clinical specimens: Peptostreptococcus harei sp. nov., Peptostreptococcus ivorii sp. nov., and Peptostreptococcus octavius sp. nov. Int. J. Syst. Bacteriol. 1997; 47:781-787. 🇬🇧

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Record number: 779385