US closes investigation into E. coli outbreak linked to onions in McDonald's Quarter Pounders - The Associated Press

1. US closes investigation into E. coli outbreak linked to onions in McDonald's Quarter Pounders  The Associated Press
2. McDonald’s E. Coli Outbreak Declared Over  The New York Times
3. CDC says E. coli outbreak linked to McDonald's over  CBS News
4. Are onions safe to eat after the E. coli outbreak? What you must know  Fox News
5. E. coli outbreak tied to McDonald's Quarter Pounders has ended, CDC says  Reuters

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