Swine flu, or H1N1 influenza, is a viral respiratory contamination that essentially influences the respiratory system. It is caused by the H1N1 type of the influenza An infection, which can spread effectively from one individual to another through respiratory beads when a tainted individual coughs or sneezes. While most individuals recover with appropriate swine flu treatment, those with weakened immune systems, young children, elderly individuals, and pregnant women are at higher risk for severe complications.