Purified tuberculin protein-π prepared from unclassified mycobacteria and human tubercle bacillus was examined on 4,461 normal healthy persons and 391 tuberculous inpatients of the some hospitals in Korea during 1963 to 1964.The results obtained in the group of normal healthy persons are as follow: The rate of positive reaction of unclassified mycobacteria was found to be 0.9 to 6.2 percent in the primary school children, 0.2 to 7.7 percent in the middle school pupil, 0.4 to 5.7 percent in the

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... ollege students. The older the age of the persons examined, the lower became the rate of positive reaction. The Positive rates observed from three different purified tuberculin protein-π photochromogens-π, scotochromogens-π and nonphotochromogens-π, were 0.4 0.9 and 6.1 percent. All positive reactors to unclassified mycobacteria-π in the primary school children showed a low-grade tuberculin reaction was decreased as the age of reactors became older, seventy-five percent of the positive reactors who had BCG vaccination were those who had vaccination three years previously. The raters of positive reaction in the tuberculous inpatients were 0.5 percent with photochromogens-π and scotochromogens-π, and 2.85 percent with nonphotochoro-mogens-π. Most of them were composed of advanced cases.