As people would have no natural immunity, a new influenza virus could cause widespread death, illness, social and economic disruption.

由于人无天然的免疫力，一种新的流感病毒可引起广泛的死亡、疾病、社会和经济破坏。

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The H1N1 pandemic was characterized by the emergence of a new influenza virus to which many people had no pre-existing immunity.

H1N 1流感大流行的特点是出现新的流感病毒，而许多人对其并没有预先存在的免疫力。

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A new influenza virus is spreading across the globe.

一种新型流感病毒正在全球蔓延。

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Mexico has the highest number of deaths and infections of the flu, which is caused by a new strain of the influenza A H1N1 virus.

VOA: standard.2009.05.08

Since neither of the two children, a 10-year-old boy and a 9-year-old girl, had contact with pigs, it "increases the possibility that human-to-human transmission of this new influenza virus has occurred, " according to a CDC report.

CNN: CDC: Swine flu seen in 2 California children

We shouldn't be seeing this much influenza and it's with a new virus and that's the cause fo the concern.

CNN: 2 U.S. swine flu dead had other health problems, officials say

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?