Advertisement McDonald's is investing $100 million into recovering from an E. coli outbreak, CNN reported.McDonald's said the outbreak led to a drop in restaurant visits and sales.Marketing and franchise support are key strategies in its efforts to regain customer trust.McDonald's is reportedly spending $100 million to lure customers back to stores following an E. coli outbreak linked to slivered onions served on Quarter Pounder hamburgers.$35 million of the investment is going toward marketing, including ...