Swine influenza, or flu, is a contagious respiratory disease that affects pigs.
CNN: WHO raises pandemic alert to second-highest level
Swine flu is a respiratory disease of pigs caused by type A influenza, according to the CDC.
CNN: CDC confirms 7 cases of swine flu in humans
Swine flu is a respiratory disease which is caused by a strain of the influenza type A virus known as H1N1.
BBC: India swine flu outbreak 'kills 94'
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