State health officials are urging anyone who has eaten a burger at a restaurant since Halloween and is experiencing diarrhea, especially bloody diarrhea, to see a healthcare professional to check for E. coli infection.

The Minnesota Department of Health said at least 10 cases of E. coli infection were identified from people who ate burgers at various Red Cow locations in Hennepin, Ramsey and Olmsted counties. At least one other person was infected after eating a meal using the same type of ground beef at Hen House Eatery in Minneapolis, officials said.

A press release on Friday stated that the ground meat product in question was also used in other restaurants, so additional cases may be reported.

Anyone who ate a particularly undercooked burger at a restaurant since Oct. 31 and developed diarrhea the following week is asked to contact their health care provider, officials said.

People with confirmed E. coli infection in the state range in age from 9 to 70 years old. Two people were taken to hospital. The meals were eaten between October 31 and November 7, and the diseases appeared between November 4 and November 9.

Minced meat product was distributed to other organizations so that additional cases from elsewhere could be identified. Health officials say there are other potential cases they are investigating.

Authorities said the owners of the two restaurants cooperated fully and made numerous changes, including tweaking products, to prevent further illness. 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 bloody stools, and only a low-grade fever or no fever. People usually get sick two to five days after eating a contaminated product, but they can also get sick after eight days. Most people recover within 5 to 10 days, but officials say about 5 percent of infections can lead to serious problems.

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