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Species Actinomyces naeslundii

Name: Actinomyces naeslundii corrig. Thompson and Lovestedt 1951 (Approved Lists 1980)

Category, proposed as: species, sp. nov.

Etymology: naes.lun’di.i. N.L. gen. masc. n. naeslundii, of Naeslund, named after Carl Naeslund who first described this organism in some detail, but did not give it a specific epithet

Pronunciation (Latin), gender: ak-ti-NO-my-kes na͡es-LUN-di-i, masculine

Type strain: ATCC 12104; CCUG 18310; CCUG 2238; CCUG 32832; CCUG 35333; CDC W826; CECT 806; CIP 103128; DSM 43013; Howell 279; JCM 8349; NCTC 10301

16S rRNA gene: AB618790 Analysetree FASTA download

Effective publication: Thompson L, Lovestedt SA. An Actinomyces-like organism obtained from the human mouth. Proc Staff Meet Mayo Clin 1951; 26:169-175.

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

  • Emendations:
    • Henssge et al. 2009 Henssge U, Do T, Radford DR, Gilbert SC, Clark D, Beighton D. Emended description of Actinomyces naeslundii and descriptions of Actinomyces oris sp. nov. and Actinomyces johnsonii sp. nov., previously identified as Actinomyces naeslundii genospecies 1, 2 and WVA 963. Int J Syst Evol Microbiol 2009; 59:509-516. 🇬🇧 Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 59, part 3 of the IJSEM. Int J Syst Evol Microbiol 2009; 59:1259-1261.
    • Nouioui et al. 2018 Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪 Oren A, Garrity GM. List of changes in taxonomic opinion no. 29. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2019; 69:13-32.
  • Notes:
    • 🧬 The phylogenomic assignment score of this taxon is 0.12359 (N = 14).
    • 😷 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: 2 - 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, 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 840 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: Actinomyces Harz 1877 (Approved Lists 1980)

Assigned by: Thompson L, Lovestedt SA. An Actinomyces-like organism obtained from the human mouth. Proc Staff Meet Mayo Clin 1951; 26:169-175.

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.772795Link copied to clipboard

Record number: 772795

  • Previous versions:
    • Version Date JSON
      1 2026-03-31 download