Bernard S, Bottreau E, Aynaud J M, Have P, Szymansky J
Institut National de la Recherche Agronomique, Laboratoire de Pathologie Porcine, Nouzilly, France.
Vet Microbiol. 1989 Nov;21(1):1-8. doi: 10.1016/0378-1135(89)90013-8.
Our objective was to evaluate the level of passive protection against transmissible gastroenteritis (TGE) among 57 newborn piglets nursing from seven seropositive sows previously naturally infected with porcine respiratory coronavirus (PRCV). After challenge exposure we observed mortality rates of 44% for litters of seven PRCV-infected sows, 40% for litters of four sows orally immunized with the attenuated TGEV strain Nouzilly, and 91% for litters of seven seronegative susceptible sows. A blocking ELISA with two appropriate monoclonal antibodies distinguished serological responses of PRCV-infected sows from those of TGEV-immunized sows. The results suggest that natural infection of the sow with PRCV may induce a degree of protective lactogenic immunity against TGE.
我们的目标是评估57头新生仔猪从7头先前自然感染猪呼吸道冠状病毒(PRCV)的血清阳性母猪哺乳时对传染性胃肠炎(TGE)的被动保护水平。在进行攻毒暴露后,我们观察到,7头感染PRCV的母猪所产仔猪的死亡率为44%,4头口服诺齐利减毒TGEV株免疫母猪所产仔猪的死亡率为40%,7头血清阴性易感母猪所产仔猪的死亡率为91%。一种使用两种合适单克隆抗体的阻断ELISA法区分了PRCV感染母猪和TGEV免疫母猪的血清学反应。结果表明,母猪自然感染PRCV可能诱导一定程度的针对TGE的保护性泌乳免疫。