Species ***Streptococcus* *alactolyticus***

Name: Streptococcus alactolyticus Farrow et al. 1985

Category: Species

Proposed as: sp. nov.

Etymology: a.lac.to.ly’ti.cus. Gr. pref. a-, not (inseparable prefix); L. neut. n. lac (gen. lactis), milk; N.L. adj. lyticus -a -um, able to loose, able to dissolve; from Gr. adj. lytikos -ê -on, able to loosen, able to dissolve; N.L. masc. adj. alactolyticus, not milk digesting

Pronunciation, gender: a-lak-to-LY-ti-kus, masculine

Type strain: ATCC 43077; CCUG 27297; CIP 103244; DSM 20728; DSM 5199; HAMBI 1719; LMG 14808; NCDO 1091; NCFB 1091; NCIMB 701091

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF201899 Analyse FASTA

Effective publication: Farrow JAE, Kruze J, Phillips BA, Bramley AJ, Collins MD. Taxonomic studies on Streptococcus bovis and Streptococcus equinus: description of Streptococcus alactolyticus sp. nov. and Streptococcus saccharolyticus sp. nov. Syst. Appl. Microbiol. 1984; 5:467-482. 🇬🇧

IJSEM list: Anonymous. Validation list no. 17. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1985; 35:223-225.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

Synonyms:

Name	Kind
Streptococcus intestinalis Robinson et al. 1988	heterotypic synonym, validly published under the ICNP

Notes:
- ⏰ According to Schlegel et al. (2003), this species is an earlier heterotypic synonym of Streptococcus intestinalis Robinson et al. 1988. Publication: Schlegel L, Grimont F, Ageron E, Grimont PA, Bouvet A. Reappraisal of the taxonomy of the Streptococcus bovis/Streptococcus equinus complex and related species: description of Streptococcus gallolyticus subsp. gallolyticus subsp. nov., S. gallolyticus subsp. macedonicus subsp. nov. and S. gallolyticus subsp. pasteurianus subsp. nov. Int J Syst Evol Microbiol 2003; 53:631-645. 🇫🇷
- 😷 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 = 1. — The risk group for Germany has been imported on 2023-10-29. 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 44 times in PubMed until 2025-06-04.
- 🪓 Organisms assigned to this species have previously been classified as Streptococcus equinus Andrewes and Horder 1906 (Approved Lists 1980). Publication: Andrewes FW, Horder TJ. A study of the streptococci pathogenic for man. Lancet 1906; 2:708-713. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
- 🫡 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 pathogenicity of the species itself. This name is not taxonomically suspended any more in favour of Streptococcus equinus Andrewes and Horder 1906 (Approved Lists 1980). Publication: Andrewes FW, Horder TJ. A study of the streptococci pathogenic for man. Lancet 1906; 2:708-713. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
- 🧍 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. 🇬🇧
- 🧍 In Validation List no. 17, the reference is erroneously cited as "Syst. Appl. Microbiol., 1985 (sic), 5, 467-482". Publication: Anonymous. Validation list no. 17. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1985; 35:223-225.
- 🧍 Given the congruence between whole cell protein electrophoreis and percentage of DNA-DNA hybridization, these data suggest that Streptococcus alactolyticus Farrow et al. 1985 is an earlier synonym of Streptococcus intestinalis Robinson et al. 1988 [1, 3]. Publication: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 49, part 2 of the IJSB. Int J Syst Bacteriol 1999; 49:937-939.
- 🧍 See also: Publication: Whiley RA, Kilian M. International Committee on Systematics of Prokaryotes Subcommittee on the taxonomy of staphylococci and streptococci. Minutes of the closed meeting, 31 July 2002, Paris, France. Int. J. Syst. Evol. Microbiol. 2003; 53:915-917. 🇬🇧

Parent taxon: Streptococcus Rosenbach 1884 (Approved Lists 1980)

Assigned by: Farrow JAE, Kruze J, Phillips BA, Bramley AJ, Collins MD. Taxonomic studies on Streptococcus bovis and Streptococcus equinus: description of Streptococcus alactolyticus sp. nov. and Streptococcus saccharolyticus sp. nov. Syst. Appl. Microbiol. 1984; 5:467-482. 🇬🇧

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Record number: 781298

This LPSN page was printed on 2026-01-17 13:25:14

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Species Streptococcus alactolyticus

Species ***Streptococcus* *alactolyticus***