Socioepidemiologic and clinico-roentgenologic features of tuberculosis in 107 adolescents were studied. In 33 per cent of the adolescents, the disease was detected on referral to a polyclinic; in 57.5 per cent of them, on planned fluorography; in 5.8 per cent, on examination as contact persons; and in 3.7 per cent, on tuberculin diagnosis. Subjects with secondary forms of tuberculosis constituted the majority among the affected. The proportion of the patients with destructive forms of tuberculosis and the excretors of tubercle bacilli made up 28.4 and 38.6%, respectively. The contact was confirmed in 36 per cent of the adolescents. The disease caused by a primary infection coincided in 9.7 per cent of them, with the rest being infected during their childhood.