Pandemic flu happens when a new flu virus spreads to people all over the world. The last pandemic starts in 2009. H1N1 virus (known as swine flu), ended in August 2010. Swine flu (swine influenza) is a respiratory disease caused by viruses (influenza viruses) that infect the respiratory tract of pigs, resulting in nasal secretions, a barking cough, decreased appetite, and listless behavior. The cause of the 2009 swine flu was an influenza A virus type designated as H1N1.In 2011, a new swine flu virus was detected. The new strain was named influenza A (H3N2)v.
In Pandemic flu 2009-2010, Number of cases and deaths found in Brazil was 58,178 and 2,135. The best treatment for influenza infections in humans is prevention by vaccination. The first H1N1 vaccine released in early October 2009 was a nasal spray vaccine that was approved for use in healthy individuals ages 2-49. The injectable vaccine, made from killed H1N1, became available in the second week of Oct. 2009.