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Species Bacteroides thetaiotaomicron
Name: Bacteroides thetaiotaomicron (Distaso 1912) Castellani and Chalmers 1919 (Approved Lists 1980)
Basonym: "Bacillus thetaiotaomicron" Distaso 1912
Etymology: N.L. neut. n. thetaiotaomicron, a combination of the Greek letters theta, iota and omicron, relating to the morphology of vacuolated forms (nominative in apposition)
Type strain: ATCC 29148; CCUG 10774; CIP 104206; DSM 2079; JCM 5827; NCTC 10582; VPI 5482
See detailed strain information at
Conduct genome-based taxonomy at
16S rRNA gene:
M58763
Analyse
FASTA
Effective publication: Castellani A, Chalmers AJ. Manual of Tropical Medicine, 3rd ed. Williams Wood and Co., New York, 1919.
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)
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Synonyms:
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Name Kind "Bacteroides fragilis subsp. thetaiotaomicron" (Distaso 1912) Holdeman and Moore 1970 homotypic synonym, not validly published, distinct rank "Bacillus thetaiotaomicron" Distaso 1912 homotypic synonym, not validly published, basonym of name in Approved Lists
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Emendations:
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Hahnke et al. 2016
Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003.
Oren A, Garrity GM. List of changes in taxonomic opinion no. 26. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2017; 67:2081-2086.
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Hahnke et al. 2016
Hahnke RL, Meier-Kolthoff JP, Garcia-Lopez M, Mukherjee S, Huntemann M, Ivanova NN, Woyke T, Kyrpides NC, Klenk HP, Goker M. Genome-Based Taxonomic Classification of Bacteroidetes. Front Microbiol 2016; 7:2003.
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Notes:
- 🧬 The phylogenomic assignment score of this taxon is 0.06258 (N = 1).
- 😷 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: 1 - 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. — 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 1110 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 2022; 168:0.
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🧍 The phylogenetic position of this species was determined in a genome-scale analysis by García-López et al. (2019).
Publication:
Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083.
Parent taxon: Bacteroides Castellani and Chalmers 1919 (Approved Lists 1980)
Assigned by: Castellani A, Chalmers AJ. Manual of Tropical Medicine, 3rd ed. Williams Wood and Co., New York, 1919.
Linking: To permanently link to this page, use https://lpsn.dsmz.de/species/bacteroides-thetaiotaomicronLink copied to clipboard
Record number: 773976
This LPSN page was printed on 2025-06-13 00:49:50