The two strains whose genes are found in the hybrid belong to influenza families known generally as North American and Eurasian pig flu.

在加利福尼亚病毒样本中发现的两种菌株的基因很常见，属于北美和欧亚猪流感株。

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But "that probably says more about the lack of sampling in pig flu than anything else," said Andrew Rambaut, a University of Edinburgh viral geneticist who has studied swine flu.

但是，“这或许是说，比起别的事情来，对猪流感的抽样调查更为缺乏，”爱丁堡大学研究过猪流感的病毒遗传学家安德鲁·兰鲍特表示。

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Studies have shown that the swine flu H1N1 is common throughout pig populations worldwide, with 25 percent of animals showing antibody evidence of infection.

研究表明H1N1猪流感在全世界猪群中都比较普遍，并且抗体证据表明有25%的动物被感染过。

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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.

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Shaman converted the guinea pig data from relative humidity to absolute humidity and found the link between air moisture and flu spread got much stronger.

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That experiment was based on the long-held notion that a pandemic strain is more likely to emerge when a flu virus mixes its genes with another virus in an animal host, such as a pig.

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