The investigation into the E. coli outbreak linked to McDonald’s Quarter Pounders, which has caused one death and sickened nearly 50 people, is increasingly focusing on slivered onions served on the hamburgers. The onions come from a single source, are sliced and packaged, and sent to restaurants. McDonald’s has removed the sliced onions and beef patties from its menu in affected areas. The strain of E. coli involved, O157:H7, can cause severe intestinal damage.
The outbreak is expected to grow as more cases are reported. Most of the cases are in Colorado, where an older adult died. Patients have also been reported in other states. The CDC began investigating after seeing a rise in E. coli cases in early October. There is concern about whether the onions were supplied to other restaurants or supermarkets, potentially leading to more recalls.
The Food Safety and Inspection Service is working with the FDA and CDC on the investigation. While the onions are believed to be the source of contamination, the safety of the ground beef used in the burgers is also being verified. Symptoms of E. coli infection include stomach cramps, diarrhea, fever, and vomiting. Some cases can lead to severe complications like kidney failure.
Efforts are ongoing to identify the specific farm or supplier responsible for the outbreak. Public health officials are urging people who have eaten at McDonald’s and are experiencing symptoms to seek medical attention. The situation is still evolving, and further updates are expected as the investigation continues.
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