Origins of H1N1 (Swine flu) Virus

The Influenza Division at the Centers for Disease Control (CDC) reported in Science that the genes found in the H1N1 (Swine flu) genome have been circulating in the environment for an extended period of time but have now combined in a new way to cause infection. By sequencing full or partial genomes of isolates of the virus found in Mexico and the United States, the researchers found