Associated Press

A Rapid City health care worker with COVID-19 came into contact with over 100 patients at Monument Health's cancer care facility, the health care company announced on Wednesday.

Monument Health announced the health care worker, who they identified as a woman, is now being treated at its facilities, the Rapid City Journal reported. Paulette Davidson, the president of Monument Health, said Wednesday that the woman came into contact with an estimated 100 patients, 10 other health care workers and two physicians. Most patients were in an ambulatory area.

People undergoing cancer treatment have weakened immune symptoms. For some people, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia, or death.

South Dakota officials said Wednesday the number of people who have tested positive for COVID-19 rose from 30 to 41. Several areas in the state have reported the illness spreading throughout communities.

Coronavirus in South Dakota:Confirmed cases, latest news and updates