A/H1N1 Influenza

H1N1 flu, also known as “swine flu,” is a respiratory disease caused by a type of influenza virus. There are several different types of the “H1N1” flu virus. One type causes illness in pigs. Another type causes illness in people. (Occasionally, the H1N1 virus from pigs can cause illness in humans and the H1N1 virus from pigs can cause disease in humans.) Recently, a new type of H1N1 flu has been found to cause illness in people. Since March 2009, there have been many cases of this new type of H1N1 flu in the United States and around the world.