From early February to mid-March, she had been on duty at Children's Memorial, Northwestern Memorial and Evanston hospitals. Many of those she came in contact with during her training were children.
So far, no patients have tested positive for tuberculosis.
Health officials say tests from close relatives have also come back negative. They believe that's good news since her family is most likely to become sick.
The investigation involves the Centers for Disease Control and Prevention and the Chicago, Cook County and Illinois departments of public health.
If you believe your child or you may have come into contact with this physician over the last five months please call 312-746-4835.
For information on TB, including symptoms and treatment, please visit the American Lung Association's Web site.