Swine influenza (swine flu) is a respiratory disease of pigs caused by a type of influenza virus. Outbreaks of swine flu happen regularly in pigs. People do not normally get swine flu, but human infections can and do happen. Most commonly, human cases of swine flu happen in people who are around pigs but it’s possible for swine flu viruses to spread from one person to another. In the United States there were 12 cases of swine flu in people from 2006 through 2008. In March and April 2009 there have been many more cases of swine flu than usual in both Mexico and the U.S. and the infections have spread from one person to another.
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