The swine influenza (also known as porcine influenza, swine flu ') is running an acute infectious disease of the airways in domestic pigs. This is caused by porcine (pig belonging to), influenza virus, the virus influenza virus A genus, species belonging to influenza A virus. By reassortment of the segments of the RNA genome of porcine and human influenza viruses, it may, when outbreaks of swine influenza to the emergence of new anti-genetic variants occur (antigenic shift) having the new animal or human pathogenic properties. These new subtypes (reassortants) are, however, no causative agent of classical swine influenza.
