SARS and swine flue are caused by
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Swine flu can affect both pigs and humans. It is a respiratory disease that results from an influenza A virus.
The influenza A variant subtype H1N1 is commonly the cause of swine flu in humans. It has similar genetic features to the H1N1 subtype of influenza virus that causes influenza in pigs.
Other main subtypes known to occur and cause influenza in pigs include H1N2 and H3N2. There have been infections in humans with these two variant subtypes as well.
In 2009, the H1N1 variant became widespread in humans for the first time.
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