The main causes of immunity failure were discovered that lower mother's antibody of chick by investigating and analysing.

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。

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Simultaneously, some available Suggestions were put forward, such as organizing craft union, overcoming immunity failure measures, improving fur quality and using rightly vaccines et al.

同时，又提出了诸如组建行业协会、克服免疫失败、提高毛皮兽用疫苗质量和正确使用兽用疫苗等方面的建议。

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Oxford University virologist Adrian. Hill believes that the failure of AIDS vaccine is still the biggest reason is that it can not be enough to stimulate immunity against HIV.

牛津大学的病毒学家阿德里安。希尔认为，艾滋病疫苗失败的最大原因还是在于它无法激发足够的免疫能力对抗艾滋病病毒。

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