She reported eating an Egg McMuffin, fries and a Quarter Pounder from McDonald’s. Those health officials, Wise said, gave the first crucial clue. That information was gleaned from interviews that state and local health officials in Colorado did with patients. As the CDC was working with state health officials and sending out questionnaires, it was simultaneously working with McDonald’s. On Oct. 28, health officials ruled out the beef patties served on the Quarter Pounders as a potential source of the E. coli.

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Persons: ”, McDonald’s, ” Ben Chapman, “, Matt Wise, Wise, Marion Nestle, “ It’s, ” Wise, patties, ” Nestle, Rachel Molatore, Nestle Organizations: Centers for Disease Control, McDonald’s, NBC News, CDC, NBC, FDA, North Carolina State University, Prevention, New York University, “ Locations: Wisconsin, Colorado, McDonald’s, Utah, Taylor