title: Susceptibility of specific pathogen-free lambs to concentrations of Pasteurella haemolytica serotype A2 in aerosols.
abstract: A 100-fold reduction in the numbers of organisms in an aerosol of Pasteurella haemolytica used to infect specific pathogen-free lambs did not alter the number of cases of pneumonia which resulted. In a separate experiment a further 10-fold reduction in the number of organisms in the aerosol did not cause fewer cases of pneumonia.
mesh_terms: D000336:Aerosols; D000391:Air Microbiology; D000818:Animals; D004198:Disease Susceptibility; D010224:Parainfluenza Virus 3, Human / Q000472:pathogenicity; D010325:Pasteurella / Q000472:pathogenicity*; D010326:Pasteurella Infections / Q000209:etiology / Q000662:veterinary*; D011014:Pneumonia / Q000209:etiology / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000209:etiology*; D013047:Specific Pathogen-Free Organisms
chemical_list: D000336:Aerosols