NCIt definition : A species of facultatively anaerobic, Gram negative, coccobacilli shaped bacteria
assigned to the phylum Proteobacteria. This species is nonmotile, catalase negative,
oxidase positive, encapsulated and nonacid fast. H. somni is a commensal organism
of the ovine and bovine respiratory, vaginal and prepucal mucosa but may become pathogenic,
causing infectious meningo encephalitis.;
Alternative definition : CDISC: Any bacterial organism that can be assigned to the species Histophilus somni.;