Source of Mystery E. Coli Outbreak That Sickened Over 100 May Be Ground Beef  GizmodoGround beef likely cause of 6-state food poisoning outbreak, officials say  WYFF GreenvilleGround beef likely cause of E. coli food poisoning outbreak in Kentucky, 5 other states  WPSD Local 6Ground beef likely cause of food poisoning outbreak in TN  NewsChannel5.comE. coli mystery solved: Ground beef is source of outbreak, CDC says  CNNView full coverage on Google News