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Swine influenza (also called H1N1 flu, swine flu) is an infection by any one of several types of swine influenza virus. Swine influenza virus (SIV) is any strain of the influenza family of viruses that is endemic in pigs. As of 2009, the known SIV strains include influenza C and the subtypes of influenza A known as H1N1, H1N2, H3N1, H3N2, and H2N3(1).

Transmission of the virus from pigs to humans is not common and does not always lead to human influenza, often resulting only in the production of antibodies in the blood. If transmission does cause human influenza, it is called zoonotic swine flu.

Swine influenza. The Merck Veterinary Manual. 2008. Retrieved on April 30, 2009. www.merckvetmanual.com/mvm/index.jsp.

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