Name: Haemophilus ducreyi (Neveu-Lemaire 1921) Bergey et al. 1923 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Coccobacillus ducreyi" Neveu-Lemaire 1921

Etymology: du’crey.i. N.L. gen. masc. n. ducreyi, of Ducrey, named after Ducrey, the bacteriologist who first isolated this organism

Gender: masculine

Type strain: ATCC 33940; CCUG 4438; CIP 54.2; DSM 8925; NCTC 10945

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M63900 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

Risk group: 2

• Synonyms:

  • Name	Kind
    "Coccobacillus ducreyi" Neveu-Lemaire 1921	homotypic synonym, not validly published, basonym of name in Approved Lists

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is -0.10347 (N = 28).
  • 😷 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 Sweden has been imported on 2024-02-05. The full classification is: risk group = 2. — The risk group for United Kingdom has been imported on 2024-01-31. The full classification is: risk group = 2. — The risk group for United States has been imported on 2024-02-09. The full classification is: risk group = 2.
  • 🎓 Name mentioned 804 times in PubMed until 2024-03-28.
  • 🧍 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.
  • 🧍 Haemophilus ducreyi has for long been recognized to be only distantly related to the type species of the genus Haemophilus. The Subcommittee on the taxonomy of Pasteurellaceae proposed to conduct a collaborative taxonomic investigation with the aim of proposing a new genus that would include Haemophilus ducreyi. Publication: Christensen H, Kuhnert P. International Committee on Systematics of Prokaryotes. Subcommittee on the taxonomy of Pasteurellaceae: minutes of the meetings, 25 August 2011, Elsinore, Denmark. Int J Syst Evol Microbiol 2012; 62:257-258.

Parent taxon: Haemophilus corrig. Winslow et al. 1917 (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.

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Record number: 776643