Frank G H, Smith P C
Am J Vet Res. 1983 Jun;44(6):981-5.
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.
在两年的时间里，对来自各个农场的犊牛在农场、拍卖场和运输1600公里后的饲养场进行鼻拭子采样，检测溶血性巴氏杆菌。测定血清抗体滴度，并对溶血性巴氏杆菌分离株进行血清分型。溶血性巴氏杆菌的分离频率在农场较低，在拍卖场较高，在饲养场显著升高。血清型2是农场的主要分离株，血清型1是饲养场以及死于急性呼吸道疾病的犊牛肺炎肺脏中的主要分离株。犊牛发生呼吸道疾病的百分比在不同农场之间存在显著差异。
