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根据谢昕等实验研究结果及畜群中大面积应用布氏菌猪种二号苗(以下简称S Ⅱ)实践证明,犊牛口服SⅡ30天后血清抗体达到高峰,360天后抗体完全消失的情况下其免疫保护力仍保持3.5～5年以上。其免疫保护机制从免疫学理论推测,可能是由
According to Xie Xin et al. Experimental results and large area application of herd in pigs, Brevibacterium bovis strain No. 2 (hereinafter referred to as S Ⅱ) proved that when the calf fed SⅡ for 30 days, the serum antibody peaked and the antibody completely disappeared after 360 days Immunity protection still remain 3.5 to 5 years. Its immunoprotection mechanism speculated from the immunological theory may be due to