Correlation and regression analysis of tuberculosis morbidity among children in Udmurtiya covered the period from 1991 to 2007. It was shown that linear functions can be used to prognosticate the morbidity rate. It is expected to increase in the near future. The morbidity rate is influenced by such factors as the lack of adequate disinfection in the foci of tuberculous infection, unfavourable living conditions, irregular treatment of infection sources, concomitant chronic pathology, incomplete family, and poorly controlled preventive chemotherapy.