title: Virulence of Moraxella bovis in gnotobiotic calves.
mesh_terms: D000818:Animals; D001424:Bacterial Infections / Q000382:microbiology / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D005856:Germ-Free Life; D009016:Moraxella / Q000472:pathogenicity*