It takes roughly three weeks to prepare the hybrid virus.

大致需要3周时间来制备混合病毒。

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They even passed a hybrid virus through a series of ferrets.

他们甚至在一系列的雪貂中传播一种混合病毒。

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They even passed a hybrid virus through a series of ferrets.

他们曾经通过已被传递的一系列病毒。

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The virus, a hybrid of swine, avian and human flu, can jump from person to person with relative ease.

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But the 2009 H1N1 virus is a hybrid of swine, avian and human strains, and no vaccine has been developed for it.

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The virus used in vaccines is not the actual virus that infects people, but rather a hybrid that's been genetically modified to make it safer, and to give it the ability to multiply more quickly -- a crucial factor when it comes to manufacturing large quantities.

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