A new influenza virus causing human illness was first detected in the United States in April 2009. Originally called “swine flu” because laboratory testing showed that many of the genes in this new virus were very similar to influenza viruses that normally occur in North American swine, it is now referred to as 2009 H1N1. Further study has shown that this virus is very different from what normally circulates in North American pigs.
Stay informed on the H1N1 virus and get tips on avoiding and fighting the flu using the tool to the left.
- Centers for Disease Control and Prevention
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