TAMPA, Fla. (WFLA) — The number of reported E. coli infections from an outbreak linked to McDonald’s quarter pounders rose to 75 cases, according to the U.S. Food and Drug Administration.

Friday, the FDA announced that the infections spanned 13 states including Colorado, Nebraska, Washington, Oregon, Montana, Wyoming, Utah, New Mexico, Kansas, Wisconsin, Michigan, Iowa, and Missouri. The infections spanned from Sept. 27, 2024, to Oct. 10, 2024.

Out of the 75 infections, at least 22 people were hospitalized for E. coli. Two of these patients developed hemolytic uremic syndrome, a condition that can lead to kidney failure.

One person, a Colorado resident in their 80s, died after contracting E. coli, according to Colorado health officials.

The FDA said 42 people were interviewed in its investigation into this outbreak, and all 42 said they ate at McDonald’s before falling ill. Thirty-nine said they ate a beef hamburger while at the fast food restaurant.

The FDA investigation has still not determined which ingredient caused the outbreak but have looked at the beef patties or slivered onions as potential causes.

“FDA is using all available tools to confirm if onions are the source of this outbreak,” the FDA release stated. This includes working with federal and state partners and the companies involved to collect and evaluate records and distribution information as part of our traceback investigation. FDA and state partners are also collecting onion samples for analysis.”

Meanwhile, McDonald’s locations in most of the affected states have stopped using slivered onions and beef patties. Taylor Farms, the supplier of the onions, also issued a voluntary recall for yellow onions, which were sold to other “food service customers.”

People who contract E. coli can experience symptoms up to nine days after eating contaminated food.

These can include severe stomach cramps, diarrhea, fever, nausea, vomiting, hemolytic uremic syndrome, high blood pressure, chronic kidney disease, and neurological problems.