The CDC has announced the conclusion of the investigation into a deadly E. coli outbreak linked to slivered onions used in McDonald’s Quarter Pounders. The outbreak, which sickened 104 individuals, resulted in 34 hospitalizations, 4 cases of kidney failure, and 1 death. The FDA has also closed its investigation, determining that the outbreak is now over. Following these developments, there are inquiries regarding the safety of onions post-outbreak. Despite the end of the investigation, a class-action lawsuit has been filed against McDonald’s, reflecting ongoing concerns related to the incident.