H1NI, or swine flu, is a respiratory disease of pigs caused by the type A influenza virus. The virus regularly causes outbreaks in pigs but rarely affects humans. Occasionally, there have been human infections of swine flu and in this current situation there is evidence of person-to-person transmission.
What are the symptoms of H1N1?
The swine flu is a new flu virus and people have little or no immunity. If this new flu virus begins to spread easily person-to-person, it could sweep across the country and around the world in a very short time. This would cause an influenza pandemic.
At this time, we do not know how serious it will be or how long it will last. As more people become infected, the risk of exposure to the public becomes greater.
San Mateo County Public Health Department:
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