To evaluate the efficacy of APP ghost as adjuvant of PCV2 Cap subunit vaccine, ISA61(r Cap+ISA61) and APP ghost(r Cap+APP-ghost) as adjuvants of r Cap vaccinated pigs twice respectively. Meanwhile, PCV2 killed vaccine group and control group were also set up and all pigs were challenged 14 days post enhanced immunization. The results showed that antibody tilers of pigs in r Cap+APP-ghost group were significantly higher than that of pigs in r Cap+ISA61 group(p<0.05); viremia were not detected in pigs in r Ca...