McDonald’s says onions or beef patties may be to blame for deadly e-coli outbreak | What to know admin 3 days ago World Leaks Comments Off on McDonald’s says onions or beef patties may be to blame for deadly e-coli outbreak | What to know 2 Views McDonald’s says either fresh, slivered onions or beef patties used for the Quarter Pounder may be behind the outbreak. Share Facebook Twitter Stumbleupon LinkedIn Pinterest