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The recent outbreak at McDonald's prompted a swift investigation by the CDC, which began on October 22. Early findings revealed many cases of E. coli infections, particularly linked to individuals consuming beef hamburgers. Though McDonald's maintains strict cooking standards to eliminate such bacteria, this outbreak points to a possible supplier issue, with onions from Taylor Farms being considered a potential source of contamination. The unfortunate outcome was a substantial financial loss for McDonald's, with tens of billions of dollars wiped off its market value almost instantly.