Wallgren P, Beskow P, Fellström C, Renström L H
National Veterinary Institute, Uppsala, Sweden.
Zentralbl Veterinarmed B. 1994 Oct;41(7-8):441-52. doi: 10.1111/j.1439-0450.1994.tb00249.x.
Porcine lungs were macroscopically and microscopically examined at slaughter, with special regard to different stages of lesions similar to those caused by Mycoplasma hyopneumoniae. There was good conformity between the macroscopical and microscopical findings. In an extended abattoir survey, lesions were found in 4210 out of 4508 lungs examined. The majority of lungs with pleuritic lesions (274 out of 369) revealed by the extended examination were registered by the official procedure. No correlation between pleuritis and time for seroconversion, or with the levels of antibodies to Actinobacillus pleuropneumoniae, was found. Among lungs affected with pneumonic lesions (n = 3841), lesions similar to those caused by Mycoplasma hyopneumoniae were predominant (n = 3769). Only 15% of these lesions were revealed by official registration at slaughter. This figure is explained by the fact that only 35% of the infections were still active at the time of slaughter and that only ongoing lesions exceeding a certain magnitude were recorded according to the official regulations. By following the development of antibodies to Mycoplasma hyopneumoniae through the fattening period, the duration of the active infection was estimated to be approximately 12 weeks. Consequently, infections with Mycoplasma hyopneumoniae gained during the early fattening period will, in general, escape detection at slaughter.
在屠宰时对猪肺进行了宏观和微观检查，特别关注与猪肺炎支原体引起的病变相似的不同阶段。宏观和微观检查结果之间具有良好的一致性。在一项扩大的屠宰场调查中，在检查的4508个肺中，有4210个发现了病变。扩大检查发现的大多数有胸膜炎病变的肺（369个中的274个）是通过官方程序记录的。未发现胸膜炎与血清转化时间或与胸膜肺炎放线杆菌抗体水平之间存在相关性。在患有肺炎病变的肺（n = 3841）中，与猪肺炎支原体引起的病变相似的病变占主导（n = 3769）。这些病变中只有15%在屠宰时通过官方记录被发现。这一数字的原因是，只有35%的感染在屠宰时仍处于活跃状态，并且根据官方规定，只有超过一定程度的正在进行的病变才会被记录。通过跟踪育肥期猪肺炎支原体抗体的发展，活跃感染的持续时间估计约为12周。因此，在育肥早期感染的猪肺炎支原体通常会在屠宰时逃过检测。
