Although passing somewhat out of the limelight, the "tuberculin test" method of case finding still has great practical value. Under certain conditions it is the only method practicable, and it will probably continue to be useful, especially in sparsely infected regions, as long as tuberculosis remains a health problem. Notwithstanding the fact that the more recently developed miniature roentgenogram method has taken first place in effectiveness, at least in the larger and more heavily infected population centers, neither method can be used to the total exclusion of the other.
While the "practical value" of any method of case finding may be dependent on the number of cases of tuberculosis found in a given community, yet case finding, which results in the saving of lives, should not be reduced strictly to a "cost per case" basis. Furthermore, tuberculous persons vary in their danger, depending on the number of bacilli they expectorate,