Name: "Peptoclostridium difficile" (Hall and O'Toole 1935) Yutin and Galperin 2013

Category: Species

Proposed as: comb. nov.

Basonym: "Bacillus difficilis" Hall and O'Toole 1935

Etymology: dif.fi.ci’le. L. neut. adj. difficile, difficult, referring to difficulties in cultivating the type strain

Gender: neuter

Type strain: ATCC 9689; BCRC 10642; CCRC 10642; CCUG 4938; CGMCC 1.2184; CIP 104282; DSM 1296; JCM 1296; LMG 15861; NCIB 10666; NCIMB 10666; NCTC 11209

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB548672 Analyse FASTA

Original publication: Yutin N, Galperin MY. A genomic update on clostridial phylogeny: Gram-negative spore formers and other misplaced clostridia. Environ Microbiol 2013; 15:2631-2641.

Nomenclatural status: not validly published

Taxonomic status: synonym (and no standing)

Correct name: Clostridioides difficile (Hall and O'Toole 1935) Lawson et al. 2016

Risk group: 2

• Synonyms:

  • Name	Kind
    Clostridioides difficile (Hall and O'Toole 1935) Lawson et al. 2016	homotypic synonym, validly published under the ICNP
    "Bacillus difficilis" Hall and O'Toole 1935	homotypic synonym, not validly published, basonym of name in Approved Lists
    Clostridium difficile (Hall and O'Toole 1935) Prévot 1938 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• 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 - human: T - biological class of risk animal: 2".

Parent taxon: "Peptoclostridium" Yutin and Galperin 2013

Assigned by: Yutin N, Galperin MY. A genomic update on clostridial phylogeny: Gram-negative spore formers and other misplaced clostridia. Environ Microbiol 2013; 15:2631-2641.

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Record number: 3210