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Relatively, a new disease, Swine flu, also known as Swine influenza (also called hog flu, and pig flu) is an infection of a host animal by any one of several specific types of microscopic organisms, called swine influenza virus. In 2009, the media labelled as swine flu, the flu caused by 2009's new strain of swine-origin A/H1N1 pandemic virus. A swine influenza virus (SIV) is an strain of the influenza family of viruses that is usually hosted by pigs. As of 2009, the known SIV strains are the influenza C virus and the subtypes of the influenza A virus, known as H1N1, H1N2, H3N1, H3N2, and H2N3. Swine influenza is common in pigs in many countries. This work is a meticulous effort, in a comprehensive, exhaustive and authentic manner. It's an asset for all scholars, researchers and medico professionals.