经调查分析发现，造成免疫失败的主要原因是雏鸡母源抗体水平低。
The main causes of immunity failure were discovered that lower mother's antibody of chick by investigating and analysing.
灭活苗可以中和剩余的母源抗体，或更易于激活机体免疫力的产生。
It is felt the killed vaccine either neutralize the remaining maternal antibody or just more easily starts the development of immunity.
本试验用V_4株、V_4株和克隆- 30株联合苗对高母源抗体的雏鸡进行了口服、滴鼻与同居感染免疫试验。
Chicks of highly maternal antibody were tested with vaccines of V4 strain and V4 clone-30 strain by oral administration, nasal drip and cohabitation.
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