结果表明：该免疫鸡群受到了MDV强毒攻击，发生了马立克氏病。
The results indicated that the immunized chicken flocks were infected by highly virulent MDV.
强毒攻击子代雏鸡后，免疫攻毒组雏鸡免疫器官T细胞数量在13日龄内明显高于未免疫攻毒组雏鸡。
After challenged, the number of t cells in immune organs of vaccinated - challenged chicks was higher than those of no - vaccinated challenged chicks after 13 days post infection.
以艾维茵肉鸡为试验动物，研究了垂体肾上腺轴在传染性腔上囊病病毒(IBDV)强毒株攻击时对免疫系统的调节作用。
Avian broilers were used as experimental objects to study the mechanism of the pituitary adrenal axis regulating immune system when being infected with virulent infectious bursal disease virus (IBDV).
以艾维茵肉鸡为试验动物，研究了垂体肾上腺轴在传染性腔上囊病病毒(IBDV)强毒株攻击时对免疫系统的调节作用。
Avian broilers were used as experimental objects to study the mechanism of the pituitary adrenal axis regulating immune system when being infected with virulent infectious bursal disease virus (IBDV).
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