Bird flu is a contagious disease caused by TYPE a flu virus.

禽流感是由A型流感病毒引起的传染性疾病。

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Swine flu is a respiratory disease of pigs caused by type a flu viruses, the CDC's Web site says.

CDC的官方网站称，猪流感是由猪a型流感病毒所致的猪呼吸道疾病。

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Swine influenza (swine flu) is an acute viral infection of the respiratory tract in pigs caused by type A influenza virus.

猪流感是一种发生在猪身上的高度传染性急性呼吸道疾病，由A型流感病毒引起。

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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

Swine flu is caused by a virus similar to the type of flu virus that, in various forms, infects people every year, but is a strain typically found only in pigs -- or in people who have direct contact with pigs.

CNN: Among the swine flu mysteries: Why only deaths in Mexico?

The last attempt to inoculate the U.S. population against a type of swine flu occurred in 1976 after some 200 soldiers from Fort Dix, New Jersey, became infected.

CNN: Shipments of H1N1 flu vaccine leave factories

Jennifer Scott was transferred by helicopter from Dumfries and Galloway Royal Infirmary after she was diagnosed with a serious "flu-type illness".

BBC: Scottish flu victim airlifted to Leicester hospital