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Species Streptococcus mitis

Classification: 

Bacteria Bacillati Bacillota Bacilli Lactobacillales Streptococcaceae Streptococcus Streptococcus mitis

Name: Streptococcus mitis Andrewes and Horder 1906 (Approved Lists 1980)

Category, proposed as: species, sp. nov.

Etymology: mi’tis. L. masc. adj. mitis, mild

Pronunciation (Latin), gender: strep-to-KOK-kus MI-tis, masculine

Type strain: ATCC 49456; Carlson's strain NS 51; CCUG 31611; CCUG 35790; CIP 103335; JCM 12971; LMG 14557; NCTC 12261; NS 51

Conduct genome-based taxonomy at tygs-logo

16S rRNA gene: AF003929 Analysetree FASTA download

Effective publication: Andrewes FW, Horder TJ. A study of the streptococci pathogenic for man. Lancet 1906; 2:708-713.

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:
    • Judicial Commission 1993 JUDICIAL OPINION 66: Designation of strain NS 51 (NCTC 12261) in place of strain NCTC 3165 as the type strain of Streptococcus mitis Andrewes and Horder 1906. Int. J. Syst. Bacteriol. 1993; 43:391.
      Notes:
      • 🧍 This emendation was not found in the expected IJSEM notification list.
    • Kilian et al. 2025 Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰 Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 75, part 3 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6765.
      Notes:
      • 🫂 Emendation accompanied by 5 proposals regarding the synonymy of the species.
  • Notes:
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus hohhotensis Li et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus chosunensis corrig. Lim et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus gwangjuensis corrig. Park et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus humanilactis Guo et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus chosunense Lim et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus gwangjuense Park et al. 2024. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Kilian et al. (2025), this species is an earlier heterotypic synonym of Streptococcus toyakuensis Wajima et al. 2022. Publication: Kilian M, Slotved HC, Fuursted K, D'Mello A, Tettelin H. Re-evaluation of boundaries of Streptococcus mitis and Streptococcus oralis and demonstration of multiple later synonyms of Streptococcus mitis, Streptococcus oralis and Streptococcus thalassemiae: description of Streptococcus mitis subsp. carlssonii subsp. nov. and emended description of Streptococcus mitis. Int J Syst Evol Microbiol 2025; 75:6704. 🇩🇰
    • ⏰ According to Li et al. (2026), this species is not an earlier heterotypic synonym of Streptococcus hohhotensis Li et al. 2024. Publication: Li MS, Wu YC, Huang CH, Chen TH. Streptococcus mitis subsp. hohhotensis (Li et al. 2024) comb. nov., replacing Streptococcus mitis subsp. carlssonii Kilian et al. 2025. Int J Syst Evol Microbiol 2026; 76:7158. 🇹🇼
    • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 75, part 3 of the IJSEM. Int J Syst Evol Microbiol 2025; 75:6765.
    • 😷 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 = 1, note = "Animal classification RG: 1 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 1". — 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. — The risk group for Taiwan has been imported on 2024-11-03. The full classification is: risk group = 2, note = "P650 = v". — 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 1603 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. 🇬🇧
    • 🧍 Replacement of type strain; IJSB 43:391. Publication: Kilian M, Mikkelsen L, Henrichsen J. Replacement of the type strain of Streptococcus mitis. Request for an opinion under Rule 18g. Int. J. Syst. Bacteriol. 1989; 39:498-499. 🇩🇰
    • 🧍 According to the NCTC, the strain NCTC 3165 (previously the type strain of Streptococcus mitis), is a strain (not the type strain) of Streptococcus gordonii Kilian et al. 1989. — Coykendall 1989 argued that the type strain of Streptococcus mitis, NCTC 3165, is not a representative of the species and proposed that Streptococcus oralis should be considered a later synonym of Streptococcus mitis and that its type strain, NCTC 11427, should become the type strain of Streptococcus mitis. This request has been denied by the Judicial Commission (see: infra). Publication: Coykendall AL. Rejection of the type strain of Streptococcus mitis (Andrewes and Horder 1906). Request for an opinion. Int. J. Syst. Bacteriol. 1989; 39:207-209.

Subdivision:

Number of child taxa with a validly published and correct name: 2
Number of child taxa with a validly published name, including synonyms: 3
Total number of child taxa: 3

Parent taxon: Streptococcus Rosenbach 1884 (Approved Lists 1980)

Assigned by: Andrewes FW, Horder TJ. A study of the streptococci pathogenic for man. Lancet 1906; 2:708-713.

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.781361Link copied to clipboard

Record number: 781361

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

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