Human swine influenza A (H1N1), commonly known as swine flu, is a new type of human influenza virus which causes respiratory disease.
In general, swine flu is a respiratory disease in pigs caused by a type A influenza virus.
Viruses that cause swine flu do not normally infect humans, although rare human infections have occurred.
The swine flu virus we are now concerned with originally came from pigs but combined with other types of viruses to make a new virus that can now be transmitted from person to person.
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