The most common seasonal flu virus found in the United States this year is type a (H1N1).

美国今年发现的最常见的季节性流感病毒是A型流感病毒(H1N1)。

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And, today the WHO said the new virus appears to be more contagious than seasonal flu virus.

今天WHO称新型病毒比季节型流感病毒接触传染性更强。

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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 most common seasonal flu virus found in the United States this year is type A(H1N1).

VOA: special.2009.03.04

W.H.O.special adviser Keiji Fukuda reported earlier this month that the virus has acted in some ways like seasonal flu.

VOA: special.2009.11.24

W.H.O.special adviser Keiji Fukuda said last week that the virus has continued to act in some ways like seasonal flu.

VOA: special.2009.11.11

Small studies in ferrets at the CDC suggest that when compared with seasonal flu, the virus appears to cause more severe disease but also seems to spread less easily.

CNN: CDC: U.S. may need 600 million swine flu vaccine doses

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 resulting surge of papers revealed that the virus is vulnerable to existing seasonal-flu vaccine and common drugs, allaying fears that mischief-makers would conjure it up and wreak havoc.

ECONOMIST: Flu research and public safety