Name: Histophilus somni Angen et al. 2003

Category: Species

Proposed as: sp. nov.

Etymology: som’ni. L. gen. masc. n. somni, of sleep, referring to one of the disease conditions associated with the bacterium

Gender: masculine

Type strain: 8025; ATCC 43625; CCUG 36157; DSM 23850

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AB176891 Analyse FASTA

Valid publication: Angen O, Ahrens P, Kuhnert P, Christensen H, Mutters R. Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'. Int J Syst Evol Microbiol 2003; 53:1449-1456.

IJSEM list: Euzeby JP. Notification list. Notification that new names and new combinations have appeared in volume 53, part 5 of the IJSEM. Int J Syst Evol Microbiol 2004; 54:3-6.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Notes:
  • 🥇 Nomenclatural type of the genus Histophilus Angen et al. 2003. Publication: Angen O, Ahrens P, Kuhnert P, Christensen H, Mutters R. Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'. Int J Syst Evol Microbiol 2003; 53:1449-1456.
  • 😷 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. — The risk group for Germany has been imported on 2023-10-29. The full classification is: risk group = 2, note = "t".
  • 🎓 Name mentioned 270 times in PubMed until 2024-03-28.
  • 🧍 Histophilus somni Angen et al. 2003 was previously known as "Histophilus ovis" Roberts 1956 or "Haemophilus agni" Kennedy et al. 1958 or "Haemophilus somnus" (sic) Bailie 1969 or "Haemophilus somnifer" Miles et al. 1972. Publication: Claxton PD, Everett RE. Recovery of an organism resembling Histophilus ovis from a ram. Aust Vet J 1966; 42:457-458.

Parent taxon: Histophilus Angen et al. 2003

Assigned by: Angen O, Ahrens P, Kuhnert P, Christensen H, Mutters R. Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'. Int J Syst Evol Microbiol 2003; 53:1449-1456.

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Record number: 784016