In response to an E. coli outbreak connected to onions used in Quarter Pounders that sickened 104 individuals, McDonald's is investing $100 million to aid impacted franchises. The CDC identified the onions as the likely cause, leading to recalls and menu changes. Although the FDA has stated no ongoing safety concerns exist, the company's sales have suffered. The investment includes $65 million targeting the hardest-hit locations. McDonald's has now resumed sales of Quarter Pounders with slivered onions, assuring customers of food safety.