This is a virus of animal origin with a unique mix of genes from swine, bird, and human influenza viruses.

这是一种由猪流感、禽流感和人流感病毒基因独特组合形成的动物源病毒。

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Five days since the announcement of Mexico's swine flu epidemic, the search for the source of the new virus that combines pig, bird and human influenza is focusing on three main possible sites.

在墨西哥的猪流感疫情公布五天后，对这种集猪、禽、人流感病毒于一身的新型病毒来源的搜索将目标对准了三个地方。

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The new virus contains genes from a seasonal human H1N1 flu strain and a flu virus common in swine and called H3N2. The new strand is not related to the current H1N1 pandemic influenza strain.

这种病毒由季节性h1n 1人流感病毒和H3N 2猪流感病毒混合而成，但与正在全球流行的甲型H1N 1流感病毒没有联系。

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Health officials in Mexico and the United States were puzzled by a virus that combined elements of swine, avian and human influenza.

VOA: standard.2009.12.25

The new virus has genes from North American swine influenza, avian influenza, human influenza and a form of swine influenza normally found in Asia and Europe, said Nancy Cox, chief of the CDC's Influenza Division.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?