title: Pasteurella haemolytica serotype 1 colonization of the nasal passages of virus-infected calves.
abstract: Nasal passages of calves with a virus-induced respiratory tract disease became colonized by Pasteurella haemolytica serotype 1 after they were inoculated intranasally with P haemolytica. Inoculation with infectious bovine rhinotracheitis virus caused a more severe clinical illness and resulted in a greater degree of colonization with P haemolytica than developed after inoculation with parainfluenza-3 virus. Nasal passages of parainfluenza-3 virus-inoculated calves were colonized to a greater degree with P haemolytica than were those of healthy, nonstressed calves. Calves were susceptible to P haemolytica colonization during or shortly after virus-induced illness, even though they had been previously exposed to P haemolytica and had serum antibody and nasal secretion antibody to P haemolytica.
authors.affiliation: National Animal Disease Center, US Department of Agriculture, Ames, IA 50010.
authors.forename: G H
authors.initials: GH
authors.lastname: Frank
authors.forename: R E
authors.initials: RE
authors.lastname: Briggs
authors.forename: K G
authors.initials: KG
authors.lastname: Gillette
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D007241:Infectious Bovine Rhinotracheitis / Q000382:microbiology*; D009668:Nose Diseases / Q000382:microbiology / Q000662:veterinary*; D010224:Parainfluenza Virus 3, Human; D018184:Paramyxoviridae Infections / Q000382:microbiology / Q000662:veterinary*; D010325:Pasteurella / Q000302:isolation & purification; D010326:Pasteurella Infections / Q000662:veterinary*