Slivered onions are the likely source of the multi-state E. coli outbreak linked to McDonald's Quarter Pounder burgers that continues to grow, the Centers for Disease Control and Prevention announced Wednesday.

Onions were one of two primary suspects when the CDC announced the outbreak on October 22, with the other being the beef patties used on the burgers. But onions quickly became the leading suspect. The day after the CDC's announcement, McDonald's onion supplier, Taylor Farms, recalled peeled and diced yellow onion products, and several other fast food chains took onions off the menu as a precaution. (No other restaurants have been linked to the outbreak to date.)

According to the CDC, traceback information and epidemiological data collected since then have all pointed to the onions, and, according to McDonald's, state and federal testing of the beef patties has all come back negative.

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One person is dead and 48 others across 10 states have been sickened in an E. coli O157:H7 outbreak that appears to be linked to McDonald's Quarter Pounders and the slivered onions used on the burgers, according to the Centers for Disease Control and Prevention.

McDonald's has paused distribution of the slivered onions and removed Quarter Pounders from the menus of restaurants in areas known to be affected. As of now, those areas include Colorado, Kansas, Utah, and Wyoming, as well as portions of Idaho, Iowa, Missouri, Montana, Nebraska, Nevada, New Mexico, and Oklahoma.

However, the CDC was quick to note that the size and span of the outbreak are likely larger than is currently known. "This outbreak may not be limited to the states with known illnesses, and the true number of sick people is likely much higher than the number reported," the agency said in its outbreak notice posted Tuesday afternoon.

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