Swine flu causes
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About Human Infections with Variant Influenza Viruses
About variant flu in people
Swine flu is a respiratory disease of pigs caused by type A influenza viruses that regularly cause outbreaks of flu in pigs (not people).
Symptoms of swine flu in adults
When an influenza virus that normally spreads in pigs but not people is found in a person, it is called a "variant influenza virus." For example, if a swine influenza A(H3N2) virus is found in a person, that virus will be called an "H3N2 variant" virus (abbreviated as "H3N2v" virus).
These viruses are genetically different from the seasonal influenza A (H1N1) and A(H3N2) viruses that commonly spread in people.
People may have little to no immune protection against those influenza A viruses that spread in pigs, and human flu vaccines do not protect against the influenza A viruses that spread in pigs.
How it spreads
Pigs to people
Influenza viruses from pigs do not normally infect people.
However, sporadic variant influenza virus infections occur among people each year. Human infections with variant influenza viruses most commonly happen in people with expos
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