不过，专家们说，很难从病毒中分离出这部分蛋白质用于疫苗，或利用基因工程生产出这种蛋白质。

But experts say it will be very difficult to isolate this part of the protein from the virus to use in a vaccine, or to manufacture it using genetic engineering.

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某人接种了疫苗或受到病毒感染后，其免疫系统就会产生抗体，主要攻击病毒表面被称为红血球凝聚素的蛋白质。

When someone is vaccinated or infected, the immune system makes antibodies that mostly attack a protein on the surface of the virus called hemagglutinin.

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One can also purify parts of the protein, that is, parts of the virus, that is, "Do I really need to deliver the whole virus?"

人们还可以纯化部分蛋白质,也就是病毒的某些部分来制造疫苗,那么还需要接种完整的病毒吗

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Well, one way to get proteins, and it was first used in Hepatitis B, is to find patients, find individuals who are already infected with Hepatitis B.

获得蛋白质的方法之一,也是首次用于制造乙型肝炎疫苗的方法,就是寻找患者,寻找到一些已经感染乙肝的患者

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If the immune system recognizes only small pieces of the virus and mounts an immune response to that, how about if I just take these pieces of a virus like some structural subunit, some piece of protein and use that as a vaccine?

如果免疫系统识别出病毒的一小段,就可以诱发起免疫应答,那么如果我仅用一小部分病毒,比如一些结构性亚基 一些蛋白质的片段,来作为疫苗的话,会如何呢

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