To determine a role of L-forms of Mycobacterium tuberculosis in the development of a recurrent tuberculous process in persons with residual pulmonary tuberculous changes, a total of 2,412 persons registered at a dispensary as those included into Groups VIIA and VIIB who were found to have a significant tuberculosis infection pool. The tuberculosis pathogen was detected in 214 (9%) examinees in the bacterial and L forms. A further follow-up of the persons whose pathological material had shown the L form which are prone to reverse indicated that the isolation of unstable mycobacterial L forms is an important predictive sign showing the high potential hazard of tuberculous process reactivation.
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