Finding this out might help us find a way of fighting the present H5N1 avian flu virus strain.

弄清这个问题将有助于我们寻找到一条途径去抗击目前的H5N1禽流感病毒株。

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This year’s seasonal vaccine contains three influenza viruses — one A (H3N2) virus, one regular seasonal A (H1N1) virus unrelated to the swine flu strain and one B virus.

今年的季节流感疫苗含有三种流感病毒——一种甲型（H3N2）病毒，一种与猪流感毒株无关的常规季节性甲型（H1N1）病毒，以及一种乙型病毒。

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The WHO said the virus from 18 of the Mexican patients was the same genetically as a new strain of swine flu, H1N1.

世卫组织指出，墨西哥感染病例中已有18例被证实感染了H1N1型猪流感病毒的一个新毒株。

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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

Even though the regular seasonal flu vaccine contains a strain of the A-flu virus group, it will not prevent you from getting sick if you come in contact with the new flu strain.

CNN: CDC: Increase seen in new swine flu strain

The strain H3N2 of the flu virus is causing many of the cases, reports suggest, and it is known to cause severe illness, especially among the elderly.

BBC: Most of US gripped by flu outbreak

Swine flu is caused by a virus similar to the regular flu virus that circulates in people every year, but is a strain that is typically found only in pigs or in people who have direct contact with pigs.

CNN: CDC: Swine flu seen in 2 California children