[Childhood tuberculosis. How to diagnose it?].

Tuberculosis is one of the conditions with higher incidence worldwide. Infection occurs when Mycobacterium enters the body, and its progression to disease occurs when immune, nutritional and vaccination status are altered. The diagnosis in children is based on elements such as contact history, tuberculin test, chest radiograph and microbiological finding of the bacillus, so these criteria will help us to make an early diagnosis and treatment, breaking the life cycle of M. tuberculosis, preventing an increase in morbidity and mortality in a community.