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a ne need ior a thorough casefinding program as an important preliminary step in a total eradication dampaign should be apparent. In the past a great number of cases of tuberculosis have been found to have had far-advanced disease by the time they were first diagnosed. Many, if not most of these, had consulted their physicians months or years before their symptoms became sufficiently definite or intense epough to suggest tuberculosis as a possible cause, either to them or to their physicians. Other persons become spreaders of infection months before they become in, or ill enough to consult a physician. Careful studies have shown that examination of close contacts to communicable cas s of tuberculosis uncovers only about 25 per cent of the new cases reported each year; i.e., three out of four cases are derived from the apparently healthy population about whom. there was no previous record of exposijre to any known case. It has been reliabily estimated that for every known case of active tuberculosis in the United States, there is at least one unknown active-case. Moreover, the best way to protect children from tuberculosis is to x-ray their parents and all other close adult associates. Obviously large scale chest x-ray surveys must be carried out sooner or later throughout the apparently healthy population, if the public is*to be protected from exposure to these hidden cases of tuberculosis and if tuberculosis is to be eliminated as a serious public health problem within a comparatively short spap of years.
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71.5%