Yet theirs is the single biggest contribution made so far to the prevention of a human flu pandemic.

但是，他们的贡献是迄今为止对预防人类流感大流行作出的独一无二的最大贡献。

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Flu viruses can swap genes with each other, so if someone carrying a human flu virus catches the new bird flu, the two strains could mingle inside the victim's body, creating a new, highly contagious and lethal human plague.

ECONOMIST: Averting a global plague | The

So while it is not certain that the Dutch team had created a deadly human strain of bird flu, it seems to be a real possibility.

BBC: When should science be censored?

The catch, Canadian officials say, is that the animals may have caught the flu from a human.

CNN: Canada: Farmer possibly gave swine flu to pigs