Data are given on the examination of 23,507 schoolchildren, students of specialized secondary and technical vocational schools covering 13 regions of the country. It has been found that tuberculosis contamination of adolescents is 30-33%, on average, but it varies considerably depending on the general epidemiologic situation at the place of residence, and the social status of adolescents. As compared to schoolchildren, tuberculosis contamination and the frequency of tuberculin reaction reversion are higher in students of technical vocational schools.
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