Rising and Falling Law Serum Antibodies Against Inactive Bivalent Vaccine of Swine Streptococcosis of Inoculated Rabbits

AGP and ELISA were applied to exam antibody level of inactive bivalent vaccine of swine Streptococcosis inoculated rabbits. The results showed that antibody appeared after 4 days of inoculation, turn positive rate of antibody was 100% after 7 days, antibody titer reached height during 15 to 30 days. Antibody titer became lower after 35 days of inoculation, antibody titer began to rise obviously after 5 days of second inoculation, the titer was above 1∶1600 after 6 months inoculation. By testing interrelation of immunation antibody and attacking protecting, it could resist 1×10 2 ～1×10 3 CFU Streptococcus equi subsp zooe pidemicus attacking when titer was above 1∶800 (including 1∶800).