Examination of risk factors of infection and falling ill with tuberculosis in 453 adolescents who had different contacts with patients with tuberculosis (a study group) and 246 from the healthy environment (a control group) has ascertained that adolescents living in death foci fell ill with tuberculosis 6 times as frequent as the controls (18.2 versus 3.3%) and 3 times as frequent as other subgroups. A subgroup from bacterial isolation foci was the second severest epidemiological risk. They fell ill with tuberculosis twice as frequent as the persons having a contact with patients without bacterial isolates (8.0 and 4.1%) and 2.5 times as frequent as the controls (8.0 and 3.3%). In these subgroups of those fell ill with tuberculosis was slightly more than in the control group (4.1, 4.0, and 3.3%, respectively).

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