This finding marks the first documented infection of this species with an avian influenza virus.

这一发现标志着首次记载了这一物种感染了一种禽流感病毒。

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Prior to the pandemic, WHO had developed guidelines for the treatment of severe influenza infections caused by the avian H5N1 influenza virus.

在大流行之前，世卫组织已制定了关于H5N1禽流感病毒造成严重流感感染的治疗指南。

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Laboratory tests confirmed the presence of the H5N1 avian influenza virus in both cases.

实验室检测证实这两起病例中都存在H5N1型禽流感病毒。

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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

According to Dr. Ron Fouchier, a Dutch virologist, this mutation allows the virus to reproduce at much lower temperatures than a standard avian influenza virus.

CNN: New bird flu well-adapted to infect people

Mayo Clinic vaccine researcher Gregory Poland counts more than a dozen new diseases that have emerged in the last few decades: HIV, Lyme disease, West Nile virus, avian influenza.

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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?