用草鱼出血病病毒疫苗处理鱼苗开口饵料 ,以口服法接种草鱼苗 ,分别于第 76、119d后测定了不同浓度下免疫草鱼的血清抗体滴度。采用方法简单、成本低廉的琼脂扩散法 ,即可测出有效免疫浓度下的血清抗体滴度为 1:8～ 1:16,相应浓度下的免疫保护力为 80 %～ 10 0 % Grass carp hemorrhagic disease virus vaccine was used to treat the fry open feed and the grass carp fry were orally inoculated. The serum antibody titer of the grass carp was tested after 76 and 119 days respectively. The simple and inexpensive agar diffusion method can be used to measure the titer of serum antibody at the effective immunization concentration of 1: 8 to 1:16 and the immunopotency at the corresponding concentration of 80% to 100%