There is a new flu virus going around.

一种新的流感病毒在四处流传。

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Ironically, after years of concern about H5N1 bird flu, the new flu causing concern is a pig virus, of a family known as H1N1.

具有讽刺意味的是，就在人们开始关注H5N1禽流感病毒若干年以后，进一步引起人们焦虑的病毒竟然是一种属于H1N1家族的猪病毒。

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Any new flu carries the risk of gene-swapping that can form mutant viruses, and this one has some swine and avian genes that, before this April, had never been seen in humans.

任何新流感都有基因转换从而产生变异病毒的危险，而这次的病毒包含有部分猪流感和禽流感的基因，在今年4月之前从未在人身上发现过。

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This is welcome news for U.S.health officials, who initially had to consider the possibility that the new flu strain's impact could mirror the devastation of the 1918 influenza pandemic that led to tens of millions of deaths worldwide.

VOA: standard.2009.05.03

Right now,as schools prepare to begin a new year, one concern is the H1N1 virus, often called swine flu.

VOA: special.2009.08.13

As of Tuesday, seventy-three countries had reported more than twenty-six thousand cases of the new H1N1 flu virus.

VOA: special.2009.06.10

"We hope this will result in the creation of a new flu drug, " he said.

BBC: NEWS | Health | Seaweed could fight flu symptoms

Health officials had returned to Edgar's sample only after cases of the new flu strain were spotted around the country.

CNN: World battles swine flu as death toll rises

When a new flu virus pops up, "we immediately begin to think about the process of making a vaccine, " Bresee said.

CNN: CDC: Increase seen in new swine flu strain