Swine influenza or flu from pigs, is an acute contagious respiratory disease pigs by a series of swine influenza virus. Finally, high morbidity and low mortality (1-4%). Of the virus in pigs by aerosols, direct and indirect contact, pigs and asymptomatic carriers. outbreaks occur in pigs in the whole year with an increase in frequency in autumn and winter in the temperate zones. Many countries routine vaccination against swine flu in pigs. swine influenza virus is the most common subtype H1N1, but other subtypes are circulating in swine (eg H1N2, H3N1, H3N2). Pigs can be infected and avian influenza, seasonal flu and swine flu virus. The H3N2 virus is suspected to be plague by the people in the pigs. Sometimes the pigs can be infected more than a kind of virus, the ones that allow May genes of these viruses to mix. This can lead to flu, the genes of a number of sources, called a "stock virus. Although the swine flu are usually specific and are not contaminated pigs, and sometimes the species barrier due to illness in humans.