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

Category: Species

Proposed as: comb. nov.

Basonym: Haemophilus segnis Kilian 1977 (Approved Lists 1980)

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

Valid publication: Norskov-Lauritsen N, Kilian M. Reclassification of Actinobacillus actinomycetemcomitans, Haemophilus aphrophilus, Haemophilus paraphrophilus and Haemophilus segnis as Aggregatibacter actinomycetemcomitans gen. nov., comb. nov., Aggregatibacter aphrophilus comb. nov. and Aggregatibacter segnis comb. nov., and emended description of Aggregatibacter aphrophilus to include V factor-dependent and V factor-independent isolates. Int J Syst Evol Microbiol 2006; 56:2135-2146.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 56, part 9 of the IJSEM. Int J Syst Evol Microbiol 2006; 56:2725-2726.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Synonyms:

  • Name	Kind
    Haemophilus segnis Kilian 1977 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.07685 (N = 32).
  • 😷 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 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 19 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.

Parent taxon: Aggregatibacter Nørskov-Lauritsen and Kilian 2006

Assigned by: Norskov-Lauritsen N, Kilian M. Reclassification of Actinobacillus actinomycetemcomitans, Haemophilus aphrophilus, Haemophilus paraphrophilus and Haemophilus segnis as Aggregatibacter actinomycetemcomitans gen. nov., comb. nov., Aggregatibacter aphrophilus comb. nov. and Aggregatibacter segnis comb. nov., and emended description of Aggregatibacter aphrophilus to include V factor-dependent and V factor-independent isolates. Int J Syst Evol Microbiol 2006; 56:2135-2146.

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Record number: 785426