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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Twenty-six more cases have been identified in a multistate E. coli O157:H7 outbreak linked to McDonald's Quarter Pounder burgers, the Centers for Disease Control and Prevention announced Friday.

The 26 new cases represent a 50 percent increase in the case count from October 22, bringing the total to 75 cases. With the new cases, health officials also reported 12 more hospitalizations, including one new adult case of hemolytic uremic syndrome (HUS), a severe complication to an E. coli O157:H7 infection. Three more states are also newly affected: Michigan, New Mexico, and Washington.

In all, the outbreak now stands at 75 cases, including 22 hospitalizations and two cases of HUS, across 13 states. The number of deaths linked to the outbreak remains at one. The most recent illness onset for the cases identified so far is October 10.

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Big-name fast food chains, including Taco Bell, KFC, Pizza Hut, and Burger King, are reportedly pulling onions off their menus in certain locations amid a deadly, multistate outbreak of E. coli O157:H7 linked to McDonald's Quarter Pounders.

Though the source of the outbreak bacteria has not been confirmed by the Centers for Disease Control and Prevention, the leading suspects are the beef patties and the sliced onions used on the popular burger.

On Wednesday, McDonald's onion supplier Taylor Farms recalled peeled and diced yellow onion products, according to a notice from US Foods, a supplier of food service operations.

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As H5N1 bird flu continues to spread wildly among California dairy herds and farmworkers, federal health officials on Thursday offered some relatively good news about Missouri: The wily avian influenza virus does not appear to have spread from the state's sole human case, which otherwise remains a mystery.

On September 6, the Missouri Health department announced that a person with underlying health conditions tested positive for bird flu, and later testing indicated that it was an H5N1 strain related to the one currently circulating among US dairy cows. But, state and federal health officials were—and still are—stumped as to how that person became infected. The person had no known contact with infected animals and no contact with any obviously suspect animal products. No dairy herds in Missouri have tested positive, and no poultry farms had reported recent outbreaks, either. To date, all other human cases of H5N1 have been among farmworkers who had contact with H5N1-infected animals.

But aside from the puzzle, attention turned to the possibility that the unexplained Missouri case had passed on the infection to those around them. A household contact had symptoms at the same time as the person—aka the index case—and at least six health care workers developed illnesses after interacting with the person. One of the six had tested negative for bird flu around the time of their illness, but questions remained about the other five.

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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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