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Content on this page was developed during the 2009-2010 H1N1 pandemic and has not been updated.

  • The H1N1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide.
  • The English language content on this website is being archived for historic and reference purposes only.
  • For current, updated information on seasonal flu, including information about H1N1, see the CDC Seasonal Flu website.

Other Flu Web Sites

Influenza A viruses are found in human and many different animals, including ducks, chickens, pigs, whales, horses and seals.

  • Seasonal Flu: is a contagious respiratory illness caused by influenza viruses that is common in the Northern Hemisphere in the fall and winter months each year.
  • provides one-stop access to U.S. Government H1N1, avian and pandemic flu information.
  • Avian Flu: usually refers to influenza A virus found chiefly in birds, but infections can occur in humans.
  • Canine Flu: is a respiratory disease of dogs caused by a specific influenza A virus.
  • Swine Flu: is a respiratory disease of pigs caused by type A influenza.
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