This is how important the Quarter Pounder is to McDonald’s — and why it will want to address E. coli issues quickly Business InsiderMcDonald’s linked to one death, dozens of food poisonings in US Al Jazeera EnglishWhere People Got Sick: E. coli Outbreak, McDonald’s Quarter Pounders – October 22, 2024 CDCWatch These McDonald’s Price Levels as Stock Drops on E. Coli Investigation Investopedia