A wave of E. coli cases across ten U.S. states led to a temporary suspension of McDonald’s Quarter Pounder sales as federal health officials investigated its potential role in the outbreak. At least 49 people reported illness after consuming meals from McDonald’s, with a significant number indicating that they had ordered the Quarter Pounder burger. These reports linked to confirmed cases of E. coli O157:H7— a bacterium notorious for causing severe stomach cramps and, in some instances, life-threatening kidney complications.
This outbreak claimed one life, and several individuals required hospitalization, underscoring the severity of the infection. The Centers for Disease Control and Prevention (CDC), along with the Food and Drug Administration (FDA) and state-level agencies, launched a coordinated investigation. Initially, both the beef patties and onions used in the Quarter Pounders were scrutinized as possible culprits, given the presence of the bacteria in both animal and environmental settings. Preliminary findings by the FDA suggested that slivered onions from a specific supplier could be the primary source of contamination, not the patties. Consequently, McDonald’s has removed slivered onions from restaurants in the affected regions and pulled the Quarter Pounder from its menu in these states as a precaution.
As a result of the outbreak and subsequent investigation, McDonald’s shares dropped approximately 9% in after-hours trading, reflecting investor concern over the restaurant chain’s food safety measures and operational protocols. This setback comes at a particularly challenging time for the company, which has struggled with lagging global sales due to inflation-driven shifts in consumer behavior, forcing McDonald’s to implement a $5 meal deal—an offer that does not include the Quarter Pounder.
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