McDonald’s stock sinks after CDC reports E. coli outbreak linked to Quarter Pounder Yahoo FinanceE. coli Outbreak Linked to McDonald’s Quarter Pounders CDCCostco could add 4 million members from crackdown akin to Netflix, says Morgan Stanley CNBCWhat we know about the McDonald’s E. coli outbreak investigation CNNMcDonald’s Stock Slumps on E. Coli Troubles. The Lesson From Chipotle. Barron’s