Subspecies Lactobacillus delbrueckii subsp. bulgaricus

Name: Lactobacillus delbrueckii subsp. bulgaricus (Orla-Jensen 1919) Weiss et al. 1984

Category, proposed as: subspecies, comb. nov.

Basonym: "Thermobacterium bulgaricum" Orla-Jensen 1919

Etymology: bul.ga’ri.cus. N.L. masc. adj. bulgaricus, Bulgarian

Pronunciation (Latin), gender: lak-to-ba-KIL-lus del-BRU͡EK-ki-i bul-GA-ri-kus, masculine

Type strain: ATCC 11842; CCUG 41390; CIP 101027; DSM 20081; IFO 13953; JCM 1002; LMG 13551; LMG 6901; NBIMCC 1132; NBRC 13953; NCTC 12712; VKM B-1923

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB007908 Analyse FASTA

Effective publication: Weiss N, Schillinger U, Kandler O. Lactobacillus lactis, Lactobacillus leichmannii and Lactobacillus bulgaricus, Subjective Synonyms of Lactobacillus delbrueckii, and Description of Lactobacillus delbrueckii subsp. lactis comb. nov. and Lactobacillus delbrueckii subsp. bulgaricus comb. nov. Syst Appl Microbiol 1983; 4:552-557.

IJSEM list: Anonymous. Validation list no. 14. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1984; 34:270-271.

Nomenclatural status: validly published under the ICNP

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

Risk group: 1

• Synonyms:

  • Name	Kind
    Lactobacillus bulgaricus (Orla-Jensen 1919) Rogosa and Hansen 1971 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP, distinct rank
    "Thermobacterium bulgaricum" Orla-Jensen 1919	homotypic synonym, not validly published, basonym of name in Approved Lists, distinct rank

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.19709 (N = 3).
  • 😷 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 2026-08-13. 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.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this subspecies. The name is on LoRN because of the recorded risk group of other species in the genus.

Parent taxon: Lactobacillus delbrueckii corrig. (Leichmann 1896) Beijerinck 1901 (Approved Lists 1980)

Assigned by: Weiss N, Schillinger U, Kandler O. Lactobacillus lactis, Lactobacillus leichmannii and Lactobacillus bulgaricus, Subjective Synonyms of Lactobacillus delbrueckii, and Description of Lactobacillus delbrueckii subsp. lactis comb. nov. and Lactobacillus delbrueckii subsp. bulgaricus comb. nov. Syst Appl Microbiol 1983; 4:552-557.

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Record number: 777292