Avian Flu

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Overview
Bird flu, also called avian flu or avian influenza (AI), is an infectious disease caused by strains of influenza A viruses. Avian influenza is highly contagious in bird populations throughout the world. It often spreads through the migration of water birds. While many types of wild birds can carry the influenza virus without becoming ill, other types of birds (e.g., domestic birds such as chickens, turkeys, and ducks) develop disease when infected with avian flu viruses.

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