Q: How often should a staff member in a doctor’s office with a positive tuberculin skin test be required to have a chest x-ray?
A: If the medical practice is assessed as low-risk for TB exposures, an employee with a new positive tuberculin skin test should have a chest x-ray. Once the x-ray rules out infectious status, additional chest x-rays are not needed unless symptoms of TB present or unless an infectious disease physician recommends one, according to CDC Guidelines for Preventing the Transmission of Mycobacterium Tuberculosis in Health-Care Settings, 2005. 
In an FAQ to the Guidelines,  questions 6 to 9 address chest x-rays for healthcare workers.
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