Novavax's bird flu vaccine uses particles that mimic the size and shape of the virus, which trigger an immune response but lack the genetic material to replicate.

诺华发明的禽流感疫苗利用了模拟病毒大小和形状的颗粒，这足以激发免疫应答但并不含有病毒复制需要的遗传物质。

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Several years ago, researchers at the University of Pittsburgh made an artificial DNA vaccine for the H5N1 bird flu virus that was greatly feared at the time.

几年前，当禽流感引起人们极大恐慌的时候，匹兹堡大学研究员研制出人工合成对抗h5n1型禽流感的DAN疫苗。

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Researchers are attempting to develop a vaccine to protect against bird flu. Still, they know that any vaccine would not be ready until a pandemic had already begun.

研究者努力开发一种保护人们不被禽流感感染的疫苗。不过，他们清楚在大流行开始之前没有任何疫苗可以造好。

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Researchers are attempting to develop a vaccine to protect against bird flu. Still, they know that any vaccine would not be ready until a pandemic had already begun.

研究者努力开发一种保护人们不被禽流感感染的疫苗。不过，他们清楚在大流行开始之前没有任何疫苗可以造好。

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