The deadly E. coli outbreak traced to slivered onions on McDonald’s Quarter Pounder hamburgers is officially over, the Centers for Disease Control said Tuesday.

Since the beginning of the CDC’s investigation into the outbreak in October, a total of 104 E. coli cases were reported in 14 states from coast to coast, with the majority of the illnesses linked to locations in Montana and Colorado.

Of those reported cases, 34 people were hospitalized and one man in Colorado died from the infection. The CDC noted the real number of cases was likely much higher since some people recover from E. coli without seeking testing or medical treatment.

The Food and Drug Administration linked the outbreak to onions from Taylor Farms, a California-based company with a facility in Colorado Springs, which sold the contaminated vegetables to McDonald’s.

The fast-food restaurant removed its Quarter Pounders from menus in all the affected states when the outbreak was announced. The burger returned to menus several days later after new onions were sourced.

The Quarter Pounder is the only McDonald’s item that features the slivered onions.

The FDA on Tuesday confirmed it had closed its investigation into the outbreak, adding there “does not appear to be a continued food safety concern” related to contaminated onions.

“The process to reach this point has at times felt long, challenging and uncertain,” McDonald’s said in a statement. “But it is critical that public officials examine every possible angle, and we are deeply grateful that they moved quickly to identify and, in partnership with McDonald’s, contain the issue. We’d like to thank them once again.”

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