title: The booster effect--a problem for surveillance of tuberculosis in hospital employees.
mesh_terms: D000367:Age Factors; D002487:Centers for Disease Control and Prevention, U.S.; D006801:Humans; D007538:Isoniazid / Q000627:therapeutic use; D010564:Personnel, Hospital; D014374:Tuberculin Test; D014376:Tuberculosis / Q000517:prevention & control*; D014481:United States
chemical_list: D007538:Isoniazid