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Causes
By Mayo Clinic staffBird flu occurs naturally in wild waterfowl and can spread into domestic poultry, such as chickens, turkeys, ducks and geese. The disease is transmitted via contact with an infected bird's feces, or secretions from its nose, mouth or eyes.
Open-air markets, where eggs and birds are sold in crowded and unsanitary conditions, are hotbeds of infection and can spread the disease into the wider community.
According to the Food and Drug Administration, bird flu cannot be transmitted by eating properly cooked poultry meat or eggs from infected birds. Poultry meat is safe to eat if it's been cooked to an internal temperature of 165 F (74 C). Eggs should be cooked until the yolk and white are firm.
- 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.
