McDonald's is facing scrutiny following a deadly E. coli outbreak linked to its Quarter Pounder hamburgers, with 49 confirmed cases and one death reported across 10 states, according to the CDC. The outbreak has been traced back to fresh slivered onions, prompting the fast-food chain to pull Quarter Pounders from about 20% of its U.S. locations, particularly in affected states like Colorado, Kansas, and Iowa. As the investigation continues, McDonald’s is working with the USDA and FDA and has halted onion distribution from its single supplier for the affected region. Health experts emphasize the importance of food safety practices and advise those who may have symptoms to consult a doctor. McDonald’s has reassured customers that its restaurants remain safe and that the contaminated food has been removed from menus. Concerns among customers have grown regarding the transparency of information related to the outbreak.