Taxonomy of Histophilus somni

  • Øystein AngenEmail author
Part of the Current Topics in Microbiology and Immunology book series (CT MICROBIOLOGY, volume 396)


Histophilus somni was proposed in 2003 as a common name for bacteria that earlier had been called “Haemophilus somni”, “Haemophilus agni”, “Haemophilus somnifer”, and “Histophilus ovis”. The species is clearly separated from other species and genera within the family Pasteurellaceae. The species is phenotypically variable, but highly uniform regarding the 16S rDNA sequence. Whole-genome sequencing has revealed distinct genetic differences between a commensal and a pathogenic strain, particularly in regard to putative virulence factors. However, broad generalizations regarding the genetics of H. somni cannot be applied to the entire species until the genomes of additional strains are sequenced.


rpoB Gene Putative Virulence Factor Strain 129Pt rpoB Sequence Actinobacillus Succinogenes 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Norwegian Veterinary InstituteOsloNorway

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