A deadly E. coli outbreak linked to McDonald's Quarter Pounders has sickened at least 49 individuals, resulting in 10 hospitalizations and one death. The outbreak is traced to slivered onions supplied by Taylor Farms in California. As a precaution, major fast-food chains like Taco Bell and Burger King have also removed onions from menus. Lawsuits are emerging, while health officials, including the CDC, are investigating the contamination source. McDonald’s has suspended Quarter Pounder sales at affected locations and aims to restore public trust in their food safety.