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.
对于一种新型并且传染性很强的病毒而言，每个人都有被感染的可能。现在大流行流感疫苗的供应不足以满足世界人口的需求。
Current supplies of pandemic vaccine are inadequate for a world population in which virtually everyone is susceptible to infection by a new and readily contagious virus.
昨天有一些正面的消息传出，墨西哥科学家说猪流感病毒的传染性并不比每年流行的季节性流感的传染性更大。
Some positive news surfaced yesterday: Mexican scientists said the contagiousness of the swine flu is no greater than that of the seasonal flu that circulates every year.
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