McDonald’s shares fall after CDC says E. coli outbreak linked to Quarter Pounders. ..and it isn't just your ordinary e. coli. There are several strains of e. coli that cause hemolytic uremic syndrome (HUS) and they include O157:H7 strain and other Shiga toxin-producing E. coli. https://www.cnbc.com/2024/10/22/mcdonalds-shares-fall-after-cdc-says-e-coli-outbreak-linked-to-quarter-pounders.html