Name: Aggregatibacter aphrophilus (Khairat 1940) Nørskov-Lauritsen and Kilian 2006

Category: Species

Proposed as: comb. nov.

Basonym: Haemophilus aphrophilus Khairat 1940 (Approved Lists 1980)

Etymology: a.phro’phi.lus. Gr. masc. n. aphros, foam; N.L. adj. philus -a -um, friend, loving; from Gr. adj. philos -ê -on, loving; N.L. masc. adj. aphrophilus, foam loving

Pronunciation (Latin), gender: ag-gre-ga-ti-BAK-ter a-P^HRO-p^hi-lus, masculine

Type strain: ATCC 33389; CCUG 3715; CIP 70.73; NCTC 5906

Conduct genome-based taxonomy at

16S rRNA gene: EU083529 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 (and explicitly recommended for medical use)

Risk group: 2

• Synonyms:

  • Name	Kind
    Haemophilus aphrophilus Khairat 1940 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Haemophilus paraphrophilus Zinnemann et al. 1968 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP

• Notes:
  • ⏰ According to Nörskov-Lauritsen and Kilian (2006), this species is an earlier heterotypic synonym of Haemophilus paraphrophilus Zinnemann et al. 1968 (Approved Lists 1980). 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. 🇩🇰
  • 😷 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 Germany has been imported on 2026-08-13. 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 103 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. This name is not taxonomically suspended any more in favour of Haemophilus aphrophilus Khairat 1940 (Approved Lists 1980). Publication: Khairat O. Endocarditis due to new species of Haemophilus. Journal of Pathology and Bacteriology 1940; 50:497-505. Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.
  • 🧍 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: 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: 785425