E.coli food poisoning linked to McDonald’s burgers has sickened at least 49 people in 10 US states, including one person who died and 10 who were hospitalised, according to federal health officials.

The death was reported in an older person in Colorado, and one child has been hospitalised with severe kidney complications, the US Centers for Disease Control and Prevention reported.

Infections were reported in Colorado, Iowa, Kansas, Missouri, Montana, Nebraska, Oregon, Utah, Wisconsin and Wyoming. Colorado has the most cases, 26, followed by Nebraska with nine. 

Everyone interviewed in connection with the outbreak had reported eating at McDonald’s before falling ill and most mentioned eating Quarter Pounder hamburgers, the CDC said. 

The US Agriculture Department, the Food and Drug Administration and state health officials are also investigating.

A specific ingredient has not been identified as the cause, but investigators are focused on onions and beef. A preliminary FDA investigation suggests that slivered onions served on the burgers are a likely source of contamination. The USDA is investigating the hamburger patties. 

In a statement, McDonald’s officials said that initial findings suggest that some illnesses are linked to onions sourced from a single supplier. The company has halted distribution of the slivered onions and temporarily removed the Quarter Pounder from menus in the affected states, and also in portions of Idaho, Nevada, New Mexico and Oklahoma. 

“We take food safety extremely seriously and it’s the right thing to do,” the statement said. 

E. coli bacteria are harboured in the guts of animals and found in the environment. 

Infections can cause severe illness, including fever, stomach cramps and diarrhoea. People who develop symptoms of E. coli poisoning should seek health care immediately and tell the provider what they ate.

The news comes in an already tough year for the Chicago-based McDonald’s chain. Its global same-store sales fell for the first time in nearly four years in the second quarter as inflation-weary customers skipped eating out or chose cheaper options. 

McDonald’s shares dropped 9 per cent in after-hours trading Tuesday after the CDC’s announcement.

The type of bacteria implicated in this outbreak, E. coli O157:H7, causes about 74,000 infections in the US each year, leading to more than 2,000 hospitalisations and 61 deaths. Infections are especially dangerous for children younger than 5 and can cause acute kidney failure.

This post was originally published on Michael West.