Name: Actinobacillus capsulatus Arseculeratne 1962 (Approved Lists 1980)

Category: Species

Proposed as: sp. nov.

Etymology: cap.su.la’tus. L. fem. dim. n. capsula, a litle chest; L. masc. adj. suff. -atus, suffix denoting provided with; N.L. masc. adj. capsulatus, encapsulated

Gender: masculine

Type strain: ATCC 51571; CCUG 12396; CIP 103283; DSM 19761; Frederiksen P243; NCTC 11408

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: M75069 Analyse FASTA

Effective publication: Arseculeratne SN. Actinobacillosis in joints of rabbits. Journal of Comparative Pathology and Therapeutics 1962; 72:33-39.

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 (and explicitly recommended for medical use)

Risk group: 2

• Emendations:
  • Kuhnert et al. 2007 Kuhnert P, Korczak BM, Christensen H, Bisgaard M. Emended description of Actinobacillus capsulatus Arseculeratne 1962, 38AL. Int J Syst Evol Microbiol 2007; 57:625-632. Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 57, part 3 of the IJSEM. Int J Syst Evol Microbiol 2007; 57:1173-1174.
    Notes:
    • 🧍 In the paper by Kuhnert et al. 2007, the type strain Frederiksen P243 is erroneously cited as Frederiksen 243.

• Notes:
  • 🧬 The phylogenomic assignment score of this taxon is 0.08476 (N = 29).
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 1, note = "animal pathogen - biological class of risk animal: 2". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 2 - 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, note = "PV". — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2, note = "t". — 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 8 times in PubMed until 2025-06-04.
  • 🙆 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.
  • 🧍 The genome of the type strain was sequenced as part of the GEBA (Genomic Encyclopedia of Bacteria and Archaea) project. Publication: Mukherjee S, Seshadri R, Varghese NJ, Eloe-Fadrosh EA, Meier-Kolthoff JP, Goker M, Coates RC, Hadjithomas M, Pavlopoulos GA, Paez-Espino D, et al. 1,003 reference genomes of bacterial and archaeal isolates expand coverage of the tree of life. Nat Biotechnol 2017; 35:676-683.

Parent taxon: Actinobacillus Brumpt 1910 (Approved Lists 1980)

Assigned by: Arseculeratne SN. Actinobacillosis in joints of rabbits. Journal of Comparative Pathology and Therapeutics 1962; 72:33-39.

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Record number: 783276