Abstract
The degree of accuracy of a selective tuberculosis case-finding method based on the use of "index-reactor" children was measured by comparing its results with those obtained by comprehensive mass roentgenography of the same community during the same period of time. In this "controlled" evaluation, it was found that the selective method led to the detection of 82% of the cases of tuberculous disease of all forms and of 79% of the cases of reinfection pulmonary tuberculosis. As the Navajo community in which the study was conducted resembled a rural economically underdeveloped society in most important particulars, it is believed that this selective casefinding method should have considerable usefulness in developing societies. This is especially true as the demographic pattern in such societies is usually one in which children comprise a large proportion of the total population.

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