McDonald's on Tuesday said its sales and restaurant visits nosedived after a deadly E.coli outbreak was linked to its Quarter Pounder burgers. "There's been an impact in the US as a result of that food safety incident [with a] shift to daily negative sales and guest count results since the beginning of the food safety incident," Chief Financial Officer Ian Borden said during an earnings call on Tuesday. The outbreak, which has been tied to the slivered onions atop the popular burger, has sickened 75 people ...