McDonald’s shares fall after CDC says E. coli outbreak linked to Quarter Pounders CNBCE. coli Outbreak Linked to McDonald’s Quarter Pounders CDCCDC warns of deadly multistate E. coli outbreak tied to McDonald’s Quarter Pounders CNNMcDonald’s hamburgers linked to deadly E. coli outbreak in the US BBC.comOne dead, 10 hospitalized from E. coli outbreak linked to McDonald’s quarter pounder New York Post