The researchers have already managed to produce pigs that were able to generate human blood by injecting blood stem cells from humans into pig foetuses

通过对猪幼胎注射人类的血液干细胞，研究人员已经成功培育出能够产生人类血液的猪

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It does trouble us from that standpoint because it's very much a public health issue right now and there's no indication that a pig gave it to a human.

从这个角度上来说，它确实给我们带来了麻烦。因为这很大程度上是一个公共健康问题。现在并没有迹象表明猪把它给人类。

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To get around the problem that human body attacks and destroys tissue from other species, one company is trying to alter the pig's genetic code to prevent pig organs from being attacked.

为了克服人体会排斥并破坏来自其他物种的组织这一障碍，一家公司正在试图改变猪的基因码，以避免猪的器官受到排斥。

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H1N1 is a more appropriate label for this flu, because a direct link from pig to human has not been established, according to Professor Marie Gramer's who studies swine disease at the University of Minnesota.

CNN: Inaccurate 'swine' flu label hurts industry, pork producers say

Tissue valves which may come from a pig, cow or human cadaver donor often need to be replaced.

CNN: Aortic valve regurgitation