Avian flu outbreak wipes out 50M US birds, a record KSL.comDeadly Bird Flu Outbreak Is The Worst In U.S. History HuffPostUS Avian Flu Outbreak Worst on Record With 50 Million Dead Birds Yahoo FinanceAvian flu wipes out a record 50.5 million birds Washington ExaminerAvian Flu Kills 50.54 Million U.S. Birds: Worst Outbreak in History PEOPLEView Full Coverage on Google News