Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'

Angen, Øystein; Ahrens, Peter; Kuhnert, Peter; Christensen, Henrik; Mutters, Reinier (2003). Proposal of Histophilus somni gen. nov., sp. nov. for the three species incertae sedis 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis'. International journal of systematic and evolutionary microbiology, 53(5), pp. 1449-1456. Reading, UK: Society for General Microbiology SGM 10.1099/ijs.0.02637-0

[img] Text
Hsomni.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (151kB) | Request a copy

Earlier investigations have shown that 'Haemophilus somnus', 'Haemophilus agni' and 'Histophilus ovis' represent the same species. In the present investigation, the taxonomic position of this species is explored further by sequencing the 16S rRNA and rpoB genes of strains that were investigated previously by DNA-DNA hybridization. These results clearly support the allocation of this species to a novel genus within the family PASTEURELLACEAE: The phenotypic separation of Histophilus somni gen. nov., sp. nov. from other members of the family can, for most strains, be based on capnophilia, yellowish pigmentation and indole production. However, due to phenotypic variation, the use of a species-specific PCR test based on the 16S rRNA gene is included in the species description. This is justified by the high sequence similarity of the 16S rRNA gene within the species and the fact that the highest sequence similarity to any other taxon within the family is 93.4 %. The type strain, 8025(T)=ATCC 43625(T)=CCUG 36157(T), was isolated in the USA from a bovine brain with lesions of thromboembolic meningoencephalitis.

Item Type:

Journal Article (Original Article)


05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute of Veterinary Bacteriology

UniBE Contributor:

Kuhnert, Peter


500 Science
500 Science > 570 Life sciences; biology
600 Technology > 630 Agriculture




Society for General Microbiology SGM




Peter Kuhnert-Ryser

Date Deposited:

30 Jan 2014 11:51

Last Modified:

10 Aug 2015 10:42

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

TME, thromboembolic meningoencephalitis




Actions (login required)

Edit item Edit item
Provide Feedback