Wallgren P, Artursson K, Fossum C, Alm G V
National Veterinary Institute, Uppsala, Sweden.
Zentralbl Veterinarmed B. 1993 Feb;40(1):1-12. doi: 10.1111/j.1439-0450.1993.tb00102.x.
Pigs in three specialized fattening herds were studied with respect to some immune functions, viral infections revealed by presence of interferon-alpha in serum as well as bacterial infections indicated by antibodies to Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae. Pigs from different breeders had signs of varying but low incidence of such infections. After transport to the fattening herds, viral infections were activated and spread during the first month, and a maximum of 19% of the pigs had signs of ongoing infections at one week. At this time, blood leukocytes prepared from the pigs had diminished ability to produce interferon-alpha in vitro. Except during the first month, serological evidence of Mycoplasma hyopneumoniae infections became gradually more frequent, and 91% of the pigs were seropositive at slaughter. Early, but not late, infections appeared to inhibit growth of the pigs as indicated by time for slaughter, but only late infections may be registered as pneumonia at slaughter. The prevalence of pigs with serological evidence of Actinobacillus pleuropneumoniae infections increased late in the fattening period, but such infections had no demonstrable impact on the time for slaughter.
对三个专门育肥猪群的猪进行了一些免疫功能方面的研究，通过血清中α干扰素的存在揭示病毒感染，以及通过猪肺炎支原体和胸膜肺炎放线杆菌抗体表明细菌感染。来自不同饲养者的猪有此类感染发生率不同但较低的迹象。运输到育肥猪群后，病毒感染在第一个月被激活并传播，在一周时有多达19%的猪有持续感染的迹象。此时，从这些猪身上制备的血液白细胞在体外产生α干扰素的能力下降。除了第一个月期间，猪肺炎支原体感染的血清学证据逐渐变得更加频繁，在屠宰时91%的猪血清呈阳性。如屠宰时间所示，早期而非晚期感染似乎会抑制猪的生长，但只有晚期感染可能在屠宰时被记录为肺炎。胸膜肺炎放线杆菌感染血清学证据阳性的猪的患病率在育肥后期增加，但此类感染对屠宰时间没有明显影响。
