Species ***Clostridium* *fallax***

Name: Clostridium fallax (Weinberg and Séguin 1915) Bergey et al. 1923 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Bacillus fallax" Weinberg and Séguin 1915

Etymology: fal’lax. L. neut. adj. fallax, deceptive

Pronunciation (Latin), gender: klos-TRI-di-um FAL-lax, neuter

Type strain: ATCC 19400; BCRC 14512; CCRC 14512; CCUG 4853; DSM 2631; JCM 1398; NCIMB 10634; NCTC 8380

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M59088 Analyse FASTA

Effective publication: Bergey DH, Harrison FC, Breed RS, Hammer BW, Huntoon FM. Bergey's Manual of Determinative Bacteriology, 1st ed. The Williams & Wilkins Co, Baltimore, 1923.

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

Synonyms:

Name	Kind
"Bacillus fallax" Weinberg and Séguin 1915	homotypic synonym, not validly published, basonym of name in Approved Lists

Notes:
- 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "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 2026-08-13. The full classification is: risk group = 2, note = "ht". — 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 15 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. 🇬🇧

Parent taxon: Clostridium Prazmowski 1880 (Approved Lists 1980)

Assigned by: Bergey DH, Harrison FC, Breed RS, Hammer BW, Huntoon FM. Bergey's Manual of Determinative Bacteriology, 1st ed. The Williams & Wilkins Co, Baltimore, 1923.

Linking: To permanently link to this page, use https://doi.org/10.83108/rn.774874Link copied to clipboard

Record number: 774874

This LPSN page was printed on 2026-09-05 08:04:54

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Species Clostridium fallax

Species ***Clostridium* *fallax***