Testing rules out Beef patties as source of E. Coli Mcdonalds Says

Question

The claim that McDonald’s is resuming sales of Quarter Pounders after testing ruled out beef patties as the source of an E. coli outbreak is accurate. The U.S. FDA has indicated that slivered onions from a specific supplier are likely responsible for the contamination. McDonald's has stated that they will sell the Quarter Pounder without slivered onions at affected locations. The outbreak has affected at least 75 people across 13 states, leading to one death and multiple hospitalizations, with the majority of cases linked to onions sourced from Taylor Farms' Colorado facility. Testing by Colorado agriculture officials confirmed that the beef patties tested negative for E. coli. While it remains unclear if the recalled onions are definitively the source of the outbreak, McDonald's has ceased sourcing from that facility.

Answer 1

After looking through the source and it's own sources, I found the CDC E-Coli Infection page (https://www.cdc.gov/ecoli/outbreaks/investigation-update-e-coli-o157-2024.html), with information on the 2024 outbreak. Both this article and the AP article that used it argue that onions are suspected to be the e-coli-infested ingredient:   "Early information from FDA indicates onions may be a source of this outbreak. Investigators from all agencies are working quickly to determine the contaminated ingredient (CDC)." Since there was no link that showed specific study results, I'm not 100% sure if the ruling out of beef patties is confirmed from this source, but every source points towards this reliable source saying that onions are the point of interest in the investigation now.