Hundreds of patients who had surgery at a Denver hospital have been tested for hepatitis C following the arrest of a surgery technician accused of swapping out her dirty syringes for ones filled with painkiller meant for patients.

Twenty-six-year-old Kristen Diane Parker is scheduled to be in federal court Thursday where a judge will determine whether she will be released on bond.

Parker has tested positive for hepatitis C. She worked at Rose Medical Center in Denver and at Colorado Springs Audubon Ambulatory Surgery Center between October and June 29. Up to 6,000 people may have been exposed to the blood-borne liver disease. State health officials say 10 hepatitis C cases in former Rose patients may be linked to Parker.