重组病毒载体因其自然感染途径而成为有效的基因转移手段。

Recombinant viral vectors have become effective tools for gene transfer by means of their natural infective ways.

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由于自然感染轮状病毒并不会造成肠套叠，因此他们认为新疫苗也不会增加这种并发症的风险。

Because natural rotavirus infection was not associated with intussusception, they reasoned their vaccine would similarly not increase the risk of this complication.

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沙宾认为，活性不足以致病、但仍可复制的活病毒疫苗，最能够模拟因自然感染所产生的保护作用。

Sabin believed that live vaccines, which can replicate somewhat but are too weak to trigger disease, best mimic the protection acquired through natural infection.

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The last reported case of smallpox in the-- naturally occurring smallpox, was in 1977, a man in Somalia was infected.

最后一例天花报告,自然产生的天花,是在一九七七年,一个索马里人感染了

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You can become dehydrated and die just as a result of the loss of water there, because of your body's natural response to the infection.

就会脱水,而失水的后果就是死亡,这是你身体对于这种感染的自然反应

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