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Updated: Mar 26, 2026

Helminth Collection and Identification from Wildlife
Published on: December 14, 2013
Taxonomy of Histophilus somni
1Norwegian Veterinary Institute, P.O. Box 750 Sentrum, 0106, Oslo, Norway. oysteinangen@gmail.com.
Abstract:
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.
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