大流行流感的防范和应对指南。
况且，把有限的疫苗生产能力投入到生产对付新的大流行流感产品意味着牺牲一部分，甚至全部的常规季节性流感疫苗供给。
What is more, switching limited vaccine-making capacity to pandemic production will mean the partial or even complete loss of normal seasonal vaccine supply.
从而我们可以简单地认为H5N1病毒缺乏成为大流行流感的能力，而H5N1要具有更强的传染性，它的致病性就不得不减弱。
That led to hopes that the H5N1 virus simply lacked the ability to be a true pandemic killer and that to become more transmissible, it would necessarily have to become less dangerous.
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