The diagnosis of primary tuberculosis contamination becomes difficult and the effectiveness of tuberculin diagnosis drastically declines under conditions of mass vaccination and threefold revaccination of children. Study of the influence of different intervals between BCG revaccination on the nature of tuberculin sensitivity was carried out in order to improve the preventive measures in children and adolescents. An increase in revaccination intervals was found to contribute to a more precise detection of primary tuberculosis contamination and larger (more than four times) BCG coverage of adolescents.
