title: Ornithobacterium rhinotracheale, a primary pathogen in broilers.
abstract: Field strains of Ornithobacterium rhinotracheale were tested on their virulence in different chicken breeds. Ornithobacterium rhinotracheale was able to induce lesions after aerosol challenge without a previous priming with virus, and thus O. rhinotracheale was proven to be a primary pathogen. The virulence of Dutch strains, isolated between 1995 and 1998, did not increase, but the Dutch isolates and a South African strain were more pathogenic compared with an American strain of O. rhinotracheale. White specific-pathogen-free leghorns were less susceptible to O. rhinotracheale infection than broilers, whereas there was no difference in susceptibility between commercial broilers and specific-pathogen-free broilers.
authors.affiliation: Animal Health Service, Poultry Section, Deventer, The Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: van Veen
authors.forename: C P
authors.initials: CP
authors.lastname: van Empel
authors.forename: T
authors.initials: T
authors.lastname: Fabria
mesh_terms: D000818:Animals; D002645:Chickens; D004198:Disease Susceptibility / Q000662:veterinary; D016946:Gram-Negative Aerobic Rods and Cocci / Q000472:pathogenicity; D016905:Gram-Negative Bacterial Infections / Q000662:veterinary*; D009894:Opportunistic Infections / Q000382:microbiology / Q000662:veterinary; D011201:Poultry Diseases / Q000382:microbiology*; D012680:Sensitivity and Specificity; D014774:Virulence