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Definition
By Mayo Clinic staffBird flu is caused by a type of influenza virus that rarely infects humans. But when bird flu does strike humans, it's often deadly. More than half the people who become infected with bird flu die of the disease.
In recent years, outbreaks of bird flu have occurred in Asia, Africa and parts of Europe. Most people who have developed symptoms of bird flu have had close contact with sick birds. In a few cases, bird flu has passed from one person to another.
Health officials worry that a global outbreak could occur if a bird flu virus mutates into a form that transmits more easily from person to person. Researchers are working on vaccines to help protect people from bird flu.
- Key facts about avian influenza (bird flu) and avian influenza A (H5N1) virus. Centers for Disease Control and Prevention. http://www.cdc.gov/flu/avian/gen-info/facts.htm. Accessed Sept. 15, 2009.
- Areas with confirmed human cases of H5N1 avian influenza since 2003. World Health Organization. http://gamapserver.who.int/mapLibrary/Files/Maps/Global_H5N1inHumanCUMULATIVE_FIMS_20090506.png. Accessed Sept. 15, 2009.
- Beigel JH. Influenza. Critical Care Medicine. 2008;36:2660.
- Influenza, Avian. In: Ferri FF. Ferri's Clinical Advisor 2010. Philadelphia, Pa.: Mosby Elsevier; 2010. http://www.mdconsult.com/das/book/body/160112679-3/888248314/2088/347.html#4-u1.0-B978-0-323-05609-0..00018-6--s1115_7157. Accessed Sept. 15, 2009.
- Stephenson I. Epidemiology, transmission and pathogenesis of avian influenza. http://www.uptodate.com/home/index.html. Accessed Sept. 15, 2009.
- Stephenson I. Avian influenza vaccines. http://www.uptodate.com/home/index.html. Accessed Sept. 15, 2009.
- Stephenson I. Clinical manifestations and diagnosis of avian influenza. http://www.uptodate.com/home/index.html. Accessed Sept. 15, 2009.
- What consumers need to know about avian influenza. FDA. http://www.fda.gov/Food/ResourcesForYou/Consumers/ucm085550.htm. Accessed Sept. 16, 2009.
- Flu (Influenza): What's the difference between seasonal flu, pandemic flu and avian (bird) flu? National Institute of Allergy and Infectious Diseases. http://www3.niaid.nih.gov/topics/Flu/understandingFlu/DefinitionsOverview.htm. Accessed Sept. 16, 2009.
- FDA clears rapid test for avian influenza A virus in humans. http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm149557.htm. Accessed Sept. 17, 2009.
- Stephenson I. Treatment and prevention of avian influenza. http://www.uptodate.com/home/index.html. Accessed Sept. 17, 2009.
- Avian influenza (bird flu). World Health Organization. http://www.who.int/mediacentre/factsheets/avian_influenza/en/print.html. Accessed Sept. 17, 2009.
- H5N1 influenza virus vaccine questions and answers. Food and Drug Administration. http://www.fda.gov/BiologicsBloodVaccines/Vaccines/QuestionsaboutVaccines/ucm080753.htm. Accessed Sept. 17, 2009.
