The current spread of a swine influenza virus has added to these concerns.

当前猪流感病毒的传播更增加了这些忧虑。

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Swine influenza virus is a type A influenza virus and as such is placed in the orthomyxovirus group.

猪流感病毒是一种A型流感病毒，因而列入正粘病毒组中。

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It derives from a swine influenza virus but the new strain has been found only in people. No pigs have been confirmed to be sick with it.

这种病毒源自猪流感病毒，但是一种仅仅在人体发现的病毒。没有猪因为该病毒发病。

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The current spread of a swine influenza virus has added to these concerns.

VOA: special.2009.07.14

Swine flu is a respiratory sickness caused by an influenza virus that mainly infects pigs.

VOA: special.2009.04.29

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 farmer "may have exposed swine on the farm to an influenza virus, " said Dr. Brian Evans of the Canadian Food Inspection Agency.

CNN: Canada: Farmer possibly gave swine flu to pigs

The children were infected with a virus known as swine influenza A H1N1, which has a unique combination of genes not previously seen in flu viruses in either humans or swine - although it shares similarities with a virus that has been circulating in pigs since 1999.

CNN: CDC: Swine flu seen in 2 California children

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?