The objective: to evaluate effectiveness of mass screening for tuberculosis infection in children aged 1 to 7 years in different periods – before and after the use of tuberculosis recombinant allergen skin test (TRA) in primary health care as an additional diagnostic method.Subjects and Methods. The study was designed as continuous observational prospective-retrospective study. Two different periods were assessed: the first one was 2014-2016 when screening for tuberculosis infection was performed in all children from 1 to 17 years (inclusive) using Mantoux test with 2 TU PPD-L in pediatric primary health care, and then children suspected to have a positive reaction were referred to TB dispensary where they were examined with a skin test with TRA if necessary. The second period was from 2018 to 2020 when children of 1-7 years old were given Mantoux test and if tuberculosis infection was suspected, a skin test with TRA was done both in primary health care network and TB units. In the first 3 years, 1,864,137 children were examined and in the second 3 years, 2,078,800 children from 1 to 7 years old were examined.Results. Among children of 1-7 years old who were screened by two stages (initial Mantoux test, and then in those who had a positive reaction, the TRA test was used), only 10-12% of those referred to a phthisiologist were subject to dispensary follow-up. Thus, with the implementation of the new edict on screening for tuberculosis infection in children with two tests, this proportion has not changed compared to previous years, when screening was carried out only with one Mantoux test. The reason why almost 90% of the children who were referred to TB Dispensary were not subject to dispensary follow-up is the following: children who have had previous conversion of tuberculin tests, along with everyone else are again screened with Mantoux test despite being previously followed up by TB dispensary due to the primary infection.Recommendations:Currently, there is no division of Group VI into Subgroups A, B, C in the dispensary follow up grouping. Why should conversion of Mantoux test reaction from negative into positive not be considered an infection, and the increase in the reaction must be at least 6 mm.Since Order No. 124n of the Russian Ministry of Health allows testing with TRA in the primary health care in case of suspected infection, it is advisable to refer those who have already had this test to a phthisiologist.A child with conversion of Mantoux test should not be re-screened with Mantoux test but the TRA test should be used. If a positive reaction to the TRA test occurs for the first time, it should be considered as conversion of this test, and in this case the child should be examined by computed tomography (CT), and preventive therapy should be prescribed. If in subsequent years the TRA reaction increases by at least 6 mm after previous preventive therapy, the child should be re-referred for CT to rule out the development of active tuberculosis.
Mantoux test results and BCG vaccination status in TB-exposed children