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- Quarter Pounders are off the menu at 20% of McDonald’s in US as E. coli cases are investigated The Associated Press
- What we know about the McDonald’s E. coli outbreak investigation CNN
- One sick in Oregon due to McDonald’s Quarter Pounder E. coli outbreak KATU
- McDonald’s, Food Safety Officials Scrutinize Onions in E. Coli Outbreak The Wall Street Journal
- McDonald’s provides update on E. coli breakout as shares drop amid scandal Yahoo Finance