[New developments in mass roentgen studies].

Since 1984 in the GDR the persons older than 40 years are summoned to participate in the mass X-ray examinations in a two-year sequence. The risk groups of tuberculosis are called up at shorter intervals, this also concerns younger people. To this belong patients with silicosis, so-called "healthy carriers of lesions", persons with contacts to patients suffering from tuberculosis, diabetics and the staff of tuberculosis hospitals and pathological institutes. Furthermore, persons working in national education, kindergartens and cattle-breeding are particularly controlled. Patients with chronic diseases of the respiratory tract need our increased attention.