The problem of tuberculosis in infancy and early childhood is a complicated one. The introduction of effective chemotherapeutic agents has resulted in a great reduction in the mortality in patients with forms of the disease that are known to be highly fatal. All these potentially fatal forms, however, begin as primary complexes associated with implantation of the organism and the development of hypersensitivity to its products, as manifested by positive tuberculin tests. Since only a small proportion of those with the skin-sensitizing exposure have progressive lesions, the problem of the management of the patient who has the primary complex but . . .