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Written By: Admin | Updated : September 8, 2012 2:22 PM IST
Bird flu also known as avian influenza is a disease that s caused by viruses and affects birds and can be passed on to humans. Bird flu s H5N1 strain has evolved such that it infects more species than any known strain and is constantly evolving. If a farm-raised bird gets affected it must be immediately culled to stop the virus from spreading.