title: Prevalence of Pasteurella haemolytica in transported calves.
abstract: In 2 different years, calves from individual farms were sampled by nasal swab for Pasteurella haemolytica at the farm, at an auction barn, and at a feedyard after they had been transported 1,600 km. Serum antibody titers were determined and P haemolytica isolates were serotyped. The frequencies of P haemolytica isolations were low at the farm, greater at the auction barn, and markedly high at the feedyard. Serotype 2 was the predominant isolate at the farm, and serotype 1 was the predominant isolate at the feedyard and from the pneumonic lungs of the calves that died of acute respiratory tract disease. There was a significant farm-to-farm variation in the percentages of calves that developed respiratory tract disease.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000276:immunology; D006386:Hemagglutination Tests; D007111:Immunity, Cellular; D010325:Pasteurella / Q000302:isolation & purification; D010326:Pasteurella Infections / Q000453:epidemiology / Q000276:immunology / Q000662:veterinary*; D012140:Respiratory Tract Diseases / Q000662:veterinary; D014186:Transportation
chemical_list: D000907:Antibodies, Bacterial