Therapy of exophytic bronchial tumorous stenosis by flexible cryoprobe.

Calmette–Guérin vaccination or nontuberculous mycobacteria. This must be determined by ongoing prospective restriction fragment length polymorphism studies observing the clinical course of QuantiFERON-gold-positive contact persons. These use ‘‘clustering’’ with the source case and observe who becomes infected with the disease. As QuantiFERON-gold is only just being implemented for routine use in western industrial countries, this question is not sufficiently answered. In our view, it would be speculative to distinguish between the predictive values of the two testing procedures. Therefore, we assigned a uniform probability of re-activation to manifest tuberculosis disease to subjects testing positive to either the tuberculin skin test or the QuantiFERON-gold assay.