The tuberculin test with PPD Rt-23 in children under 14 years old, in two areas of São Paulo city was studied. From 1960 to 1969, in the Tuberculosis Ambulatory of the School of Public Health of S. Paulo, 18,129 persons were examined, and from 1966 to 1969 in the Tuberculosis Ambulatory of the "Associação dos Sanatórios Populares "Campos do Jordão" 38,436 persons were examined. In both communities the same method and direction were used. The percentage of positive reactors was lower than 10.6 in the persons examined.
Tuberculosis; Childhood infections; Tuberculin test
