McDonald’s Stock Drops on E. coli Outbreak Linked to Burgers Barron’sHow McDonald’s can learn from other fast-food giants in recovering from the deadly E. coli outbreak Business InsiderE. coli Outbreak Linked to McDonald’s Quarter Pounders CDCUS deadly E. coli outbreak linked to McDonald’s burgers DW (English)Baird downgrades McDonald’s after E. coli outbreak CNBC