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[The risk group in the contingents of a correction institution: the structure and procedure for its observation].

Studies were made of the structure of individuals with residual pulmonary changes who were at corrective labour institutions. Among them, the incidence of active tuberculosis is 16-21 times greater than that of reactivation among the other populations. It is these persons who should be regarded as a risk group and regular prophylactic measures should be used in them.