Avian flu outbreak wipes out 50M US birds, a record KSL.comDeadly Bird Flu Outbreak Is The Worst In U.S. History HuffPostAvian flu outbreak in U.S. worst on record, over 50 million birds dead AxiosAvian Flu Kills 50.54 Million U.S. Birds: Worst Outbreak in History PEOPLEAvian Flu Kills Record 50.54M Birds in US NewsmaxView Full Coverage on Google News