Abstract
K reaction, Costa's, Darányi's and cadmium reaction tests were applied to persons in normal health, cured of presently suffering from pulmonary tuberculosis, and their values in practical use studied in comparison. The following results were obtained.
1) K reaction showed higher rates of negative results than the other 3 methods, when applied to healthy persons and those cured of tuberculosis.
2) In pulmonary tuberculosis patients, K reaction showed higher rates of positive reaction than the other methods.
3) K reaction test is simpler in operation and more welldefind in estimation of the results than the other methods.
From these results, we are led to conclude that K reaction test is better adapted for practical use than Costa's, Daranyi's and cadmium reaction tests.
