H1N1, or swine flu, is back. It first appeared during the 2009 flu season and quickly caused fear and confusion around the world. The virus spreads when you touch an infected surface or breathe cough and sneeze droplets in the air. If you are infected, you can be contagious for up to 10 days. The symptoms are the same as the seasonal flu -- cough, sore throat, and body aches. Young children, pregnant women, and older adults are more likely to develop complications. Tamiflu and Relenza can treat or prevent swine flu. But an annual flu shot is your best bet against this virus. Follow the links below to find WebMD's comprehensive coverage about how you get H1N1, how to treat it, and much more.