The tuberculin test standardized with 2 T.U. of PPD Rt 23 was applied to 35,680 people of all ages and both sexes, living in the municipality of Ribeirão Preto, São Paulo, Southeast region of Brazil. The aspect of the histograms representative of the tuberculin sensitivity suggests the existence of infections by Anonymous Mycobacteria in this area.
Tuberculin sensitivity; Anonymous mycobacteria; Tuberculin test