[Main sources of the formation of contingents of tuberculosis patients with drug-resistant or sensitive Mycobacterium tuberculosis isolates].

To form contingents of pulmonary tuberculosis patients with isolated drug-resistant Mycobacteria tuberculosis (MBT) strains, chronic patients having the disease for more than 3 years (50.3%) head the list, new cases (36.9%) detected in the past 3 years (1994-1996) rank second, next are those with relapsing tuberculosis (12.8%) identified in 1994-1996. The ratio of the above group of patients with isolated drug-sensitive MBT species is 23.3, 68.8, and 7.9%, respectively.