We know now that it's caused by a related virus, called vaccinia, remember the virus that causes smallpox is called variola.

我们现在知道这病由一种相关的病毒引起,这种病毒叫牛痘病毒,想想天花病毒也被叫做牛痘病毒

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You would first get exposed in children-- in childhood and then at a point when you're susceptible to the disease.

在儿童期这个较容易受病毒感染时期,第一次接触该病毒,就会引起发病

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If you just introduced this polio virus, which you could make in large quantities into people now, you would be causing polio.

如果你直接接种脊髓灰质炎病毒,将大量的病毒直接接种到人体,就会引起小儿麻痹症

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So, you couldn't introduce the live virus in because that would cause the disease not just immunity.

所以 不可以直接接种活体病毒,因为这会使人致病而不仅是引起免疫应答

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The whole category of diarrheal diseases, caused by viruses called enteroviruses, where they, it infects your gut.

所有种类的腹泻,都是由肠道病毒引起的,它们感染了肠道

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So, polio--the disease caused by polio can be a paralytic disease, crippling, and in some cases can lead to death if the disease progresses in certain ways.

小儿麻痹症便是由脊髓灰质炎病毒引起的,如果脊髓灰质炎发展到一定程度,患者不仅会瘫痪或者残疾,一些病例甚至可能死亡

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Viruses, you know about viruses; variola, we're going to talk about next week which causes smallpox, influenza, which causes the flu and HIV of course which cause AIDS are some examples.

病毒 你们都知道病毒,像天花病毒,我们下周会讲的引起天花的病毒,还有引起流感的流感病毒,引起艾滋病的人类免疫缺陷病毒等等

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Adenoviruses are viruses that give upper respiratory infections, they cause colds.

腺病毒可以感染上呼吸道,引起感冒

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Smallpox is a virus called variola, it's a virus that contains DNA.

天花是病毒引起的,这种病毒含DNA

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