FIRESTONE, Colo. (CBS4) – Three cases of life-threatening typhoid fever have been confirmed in Colorado. All three of the people sickened with the rare bacterial infection had eaten at a Qdoba Mexican Grill in Firestone in August.

“It’s a bit unnerving,” said Carol from Chicago.

READ MORE: 11 African Lions Test Positive For COVID At Denver Zoo

She and her husband, John, had just eaten at the Qdoba.

“Hopefully we won’t get anything,” said John.

State epidemiologist Dr. Lisa Miller with the Colorado Department of Public Health and Environment said they shouldn’t. That’s because the outbreak occurred in August.

“We have no information, no evidence that there is any ongoing risk,” said Miller.

TYPHOID FEVER map

According to Miller, the 3 cases of typhoid fever were just reported in the past few weeks. That’s because incubation of the rare infection and diagnosis take time. The three customers came down with headaches, fever and other symptoms.

“Two of these three people were actually hospitalized, so they were quite sick,” said Miller.

According to Miller, tests of employees showed the source of the illness was an infected food handler at the Qdoba who spread the salmonella typhi bacteria. According to Miller, “Someone sheds it in their feces and contaminated food or directly contaminated something that somebody else ingests.”

READ MORE: Judge Expected To Rule On Douglas County Schools Mask Lawsuit On Tuesday

Carol from Chicago said, “Guess we just have to trust the health department to do their jobs.”

Miller said, “We have searched for other cases and have not found any.”

“We are still doing some follow up investigation with former employees of the restaurant to rule out anyone else who may have become sick,” Weld County Health Department spokesperson Eric Aakko said. “The restaurant is being very cooperative with the investigation so right now our department and the state health department feels comfortable that there’s no need to close the restaurant.

“The good news is that worker is no longer handling food at the restaurant.”

A sign in the bathroom at Qdoba (credit: CBS)`

A sign in the bathroom at Qdoba (credit: CBS)`

In a statement Qdoba said, “Although the restaurant’s operations have not been impacted, as a precaution the franchisee stepped up sanitation of all touch points in the restaurant and discarded all food the worker may have been in contact with.”

Typhoid fever is rare. Health officials said Colorado averages about five cases a year. They said the three people who got sick have recovered. The illness is treated with antibiotics.

MORE NEWS: Many Colorado Pharmacies Slammed With Demand As COVID Booster Eligibility Widens

Kathy Walsh is CBS4’s Weekend Anchor and Health Specialist. She has been with CBS4 for more than 30 years. She is always open to story ideas. Follow Kathy on Twitter @WalshCBS4.