title: Antigenic heterogeneity of Haemophilus somnus.
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis*; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D003168:Complement Fixation Tests; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006190:Haemophilus / Q000276:immunology* / Q000472:pathogenicity; D006192:Haemophilus Infections / Q000382:microbiology / Q000662:veterinary*; D008297:Male; D014774:Virulence
chemical_list: D000942:Antigens, Bacterial