Optimal Time of Initial Administration of Live Vaccine for Infectious Burasal Desease in Chicks with Maternally Derived Antibody.
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概要
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The optimal time of initial vaccination with a mild-type live IBD vaccine in chicks with maternally derived antibody (MDA) was studied. The half-life of MDA was 3.46 days, and critical MDA titer to protect from infection with field virus was 1: 28. The protective immunity was acquired 6 days after vaccination, and an MDA titer of 1: 28 interfered with active immunization. If the initial vaccination should be made at age when geometric mean MDA titer lowered to 1: 80, the optimal time (Y) was calculated from age of MDA titration in days (Z) and log<SUB>10</SUB> geometric mean MDA titer (X) of flocks by the following formula; <I>Y</I>=11.49<I>X</I>+<I>Z</I>-21.87.
- 公益社団法人 日本獣医師会の論文
公益社団法人 日本獣医師会 | 論文
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