State health officials are urging anyone who ate a hamburger at a restaurant since Halloween and who has developed diarrhea, particularly bloody diarrhea, to contact a medical provider to check for E. coli infection.

The Minnesota Department of Health said at least 10 cases of E. coli infection have been established from people who ate burgers at several Red Cow locations in Hennepin, Ramsey and Olmsted counties. At least one other person became infected after eating at Hen House Eatery in Minneapolis, which used the same type of ground beef, officials said.

That particular ground beef product was also used at other restaurants, so additional cases might be reported, a news release Friday said.

If anyone ate at a restaurant, particularly an undercooked burger, since Oct. 31 and then developed diarrhea the following week, they are asked to contact their health care provider, officials said.

The people who have confirmed E. coli infections in the state range from 9 to 70 years old. Two people were hospitalized. The meals were eaten between Oct. 31 and Nov. 7 and illnesses appeared from Nov. 4 through Nov. 9.

The ground beef product was also distributed to other establishments, so additional cases from other locations could be identified. Health officials say there are other potential cases that they are investigating.

Officials say the owners of the two restaurants are fully cooperating and have made multiple changes including changing products to prevent further illnesses. The state health department is working with the state agriculture department and other local agencies during this investigation.

Symptoms of E. coli include stomach cramps and diarrhea, often with bloody stools and only a low-grade or no fever. People typically become ill two to five days after eating a contaminated product but could be sick as many as eight days after. Most people recover in five to 10 days, but officials say about 5% of infections can lead to severe problems.

About 100 cases of E. coli are reported each year in the state.

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