McDonald’s yanked Quarter Pounders at roughly one-fifth of its US locations after a deadly E.Coli outbreak was linked to the popular burger, the company said Wednesday. Federal agencies announced Tuesday that one person had died in Colorado and 49 others were sickened in 10 states across the Midwest and WestThe nation’s largest fast-food chain said Wednesday that it is confident the culprit of the outbreak were slivered onions atop the Quarter Pounder. 3 McDonald’s has yanked Quarter Pounders in states w ...