from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A potentially fatal infection in birds caused by any of various subtypes of the influenza virus, especially the H5N1 virus, which is highly contagious among birds and can be transmitted to humans who have been in direct contact with infected birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun avian influenza


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