CDC H1N1 Flu | H1N1 Flu and You - Centers for Disease Control and Prevention
2009 H1N1 Flu What is 2009 H1N1 (swine flu)? 2009 H1N1 (sometimes called “swine flu”) is a new influenza virus causing illness in people. This new virus was first detected in people in the United States in April 2009. This virus is spreading from person-t...