C.: Screening for tuberculosis in a civilian population by fluorography

T H E control of tuberculosis must be based on the same general principles that are applicable to the control of all communicable diseases. Since there is no effective means so far developed for immunizing the population against tuberculosis, the efforts to prevent its occurrence must rest largely on limiting the spread of the organism responsible for the cause of the disease. Since bovine tuberculosis has been so well controlled in this country the one re-maining important source of tubercle bacilli is the persons who have tu-berculosis. It therefore becomes of prime importance to detect as far as possible all the cases of tuberculosis in the community not only for the sake of finding them early when a good chance of recovery exists but also before they have had any opportunity to spread the infection to those about them. The insidiousness of the onset of tuberculosis either through lack of symptoms at all or the presence of symptoms like those of a cold or other res-piratory disease not regarded too seriously by the patient makes it very ap-parent that if the patient waits until he has really become ill enough to see