McDonald’s Stock Drops on E. coli Outbreak Linked to Burgers Barron’sE. coli Outbreak Linked to McDonald’s Quarter Pounders CDCHow McDonald’s can learn from other fast-food giants in recovering from the deadly E. coli outbreak Business InsiderUS deadly E. coli outbreak linked to McDonald’s burgers DW (English)Nebraska, Colorado mostly affected in multi-state outbreak of E. coli Nebraska Examiner