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[Causes of tuberculosis in successfully BCG vaccinated infants and preschool children].

Tuberculosis has developed in 21.5% of infants and preschool children effectively vaccinated with BCG. 85.1% of them had uncomplicated and mild forms of the disease. The onset of tuberculosis in the vaccinated children was explained primarily by poor prophylactic measures among population as a whole and in the risk groups, unsatisfactory search for sources of the infection.