title: [Tuberculin and mass x-ray investigations in the schools of Catania].
mesh_terms: D006801:Humans; D008168:Lung; D014373:Tuberculin; D014374:Tuberculin Test / Q000706:statistics & numerical data*; D014376:Tuberculosis; D014397:Tuberculosis, Pulmonary / Q000517:prevention & control*; D014965:X-Rays
chemical_list: D014373:Tuberculin
keywords: TUBERCULIN REACTION/statistics; TUBERCULOSIS, PULMONARY/prevention and control