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McDonald's E. coli crisis reveals why vegetable contamination is 'harder problem' than beef

Fast-food chains removed onions from menus due to a McDonald's E. coli outbreak, highlighting produce contamination risks compared to beef, necessitating improved safety measures.

McDonald's onions under scrutiny after US E. coli outbreak

Fresh onions linked to an E. coli outbreak at McDonald's have sickened 49 people, led to one death, and prompted menu changes in several states.