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Species Streptococcus agalactiae
Name: Streptococcus agalactiae Lehmann and Neumann 1896 (Approved Lists 1980)
Etymology: a.ga.lac.ti’ae. Gr. fem. n. agalaktia, want of milk; N.L. gen. fem. n. agalactiae, of agalactia
Pronunciation (Latin), gender: … a-ga-lak-TI-a͡e, masculine
Type strain: ATCC 13813; CCUG 4208; CIP 103227; DSM 2134; JCM 5671; LMG 14694; NCTC 8181
Conduct genome-based taxonomy at
16S rRNA gene:
AB023574
Analyse
FASTA
Effective publication: Lehmann KB, Neumann R. Atlas und Grundriss der Bakteriologie und Lehrbuch der speziellen bakteriologischen Diagnostik. Teil 2: Text, 1st ed. J.F. Lehmann, München, 1896.
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, conserved name
Taxonomic status: correct name (and explicitly recommended for medical use)
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Synonyms:
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Name Kind Streptococcus difficile Eldar et al. 1995 heterotypic synonym, inaccurate spelling Streptococcus difficilis corrig. Eldar et al. 1995 heterotypic synonym, validly published under the ICNP
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Notes:
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⏰ According to Kawamura et al. (2005), this species is an earlier heterotypic synonym of Streptococcus difficilis corrig. Eldar et al. 1995.
Publication:
Kawamura Y, Itoh Y, Mishima N, Ohkusu K, Kasai H, Ezaki T. High genetic similarity of Streptococcus agalactiae and Streptococcus difficilis: S. difficilis Eldar et al. 1995 is a later synonym of S. agalactiae Lehmann and Neumann 1896 (Approved Lists 1980). Int J Syst Evol Microbiol 2005; 55:961-965.
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⏰ According to Kawamura et al. (2005), this species is an earlier heterotypic synonym of Streptococcus difficile Eldar et al. 1995.
Publication:
Kawamura Y, Itoh Y, Mishima N, Ohkusu K, Kasai H, Ezaki T. High genetic similarity of Streptococcus agalactiae and Streptococcus difficilis: S. difficilis Eldar et al. 1995 is a later synonym of S. agalactiae Lehmann and Neumann 1896 (Approved Lists 1980). Int J Syst Evol Microbiol 2005; 55:961-965. 🇯🇵
- 🧬 The phylogenomic assignment score of this taxon is 0.13180 (N = 3).
- 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "default: 2 human and animal pathogen - biological class of risk animal: 2; contagiosae: 2 human and animal pathogen - biological class of risk animal: 2". — 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 2023-10-29. The full classification is: risk group = 2, note = "ht". — The risk group for France has been imported on 2024-08-30. 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". — The risk group for United Kingdom has been imported on 2024-01-31. 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 4881 times in PubMed until 2025-06-04.
- 🙆 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.
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🧍 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. 🇬🇧
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🧍 Conserved name (Judicial Opinion 8). Only conservation of a name, and over all earlier homotypic synonyms.
Publication:
Judicial Commission. Judicial Opinion No. 14. Int J Syst Bacteriol 1954; 4:156-158.
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🧍 This name was treated in Judicial Opinion 27, which designated a neotype.
Publication:
Judicial Commission. Judicial Opinion No. 27. Int J Syst Bacteriol 1963; 13:37.
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⏰ According to Kawamura et al. (2005), this species is an earlier heterotypic synonym of Streptococcus difficilis corrig. Eldar et al. 1995.
Publication:
Kawamura Y, Itoh Y, Mishima N, Ohkusu K, Kasai H, Ezaki T. High genetic similarity of Streptococcus agalactiae and Streptococcus difficilis: S. difficilis Eldar et al. 1995 is a later synonym of S. agalactiae Lehmann and Neumann 1896 (Approved Lists 1980). Int J Syst Evol Microbiol 2005; 55:961-965.
Parent taxon: Streptococcus Rosenbach 1884 (Approved Lists 1980)
Assigned by: Lehmann KB, Neumann R. Atlas und Grundriss der Bakteriologie und Lehrbuch der speziellen bakteriologischen Diagnostik. Teil 2: Text, 1st ed. J.F. Lehmann, München, 1896.
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This LPSN page was printed on 2026-06-10 14:48:09