8LI H, YANG H, Infection of Porcine reproductive and respiratory syndrome virus suppresses the antibody response to classical swine fever virus vaccination [ J ]. Vet Microbiol, 2003,95 ( 4 ) : 295 - 301.
9LEHMAN J R,WEIGEL R M, SIEGL A M, et al. Progress after one year of a pseudoorabies eradication program for large swine herds [J].J Am Vet Med Assoc,1993,3(1) :118 -121.
10Morenkov OS,etalfodor I.indireet ELISA's based on recombinant and affinity-purified glyeopro tein E of Aujeszky's disease virus to differentiate between vaccinated and infected animals[J].Acta Vet Hung,1999,47(1):137- 150.
