The results of study of a tuberculosis infection course in different conditions and its association with BCG revaccination are presented. The Moscow region was tentatively divided into 3 groups of regions. Children of Group 1 were not given revaccination at 7 and 12 years, those of Group 2 at 12 years and those of group 3 received revaccination according to the routine techniques at 7, 12 and 17 years. BCG revaccination withdrawal caused no increase in tuberculosis morbidity and tuberculin sensitivity. Tuberculosis detections were unassociated with the frequency of previous BCG revaccination.