Name: Haemophilus segnis Kilian 1977 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: seg’nis. L. masc. adj. segnis, slow, sluggish, inactive

Gender: masculine

Type strain: ATCC 33393; CCUG 10787; CCUG 12838; CIP 103292; DSM 21418; HK316; NCTC 10977

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M75043 Analyse FASTA

Effective publication: Kilian M. A taxonomic study of the genus Haemophilus, with the proposal of a new species. J Gen Microbiol 1976; 93:9-62.

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: synonym (and not recommended for medical use)

Correct name: Aggregatibacter segnis (Kilian 1977) Nørskov-Lauritsen and Kilian 2006

Risk group: 2

• Synonyms:

  • Name	Kind
    Aggregatibacter segnis (Kilian 1977) Nørskov-Lauritsen and Kilian 2006	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Haemophilus segnis is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Haemophilus.
  • 😷 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 24 times in PubMed until 2025-06-04.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.

Parent taxon: Haemophilus corrig. Winslow et al. 1917 (Approved Lists 1980)

Assigned by: Kilian M. A taxonomic study of the genus Haemophilus, with the proposal of a new species. J Gen Microbiol 1976; 93:9-62.

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Record number: 795963