A serological technique, using formalinized red cells coupled to tuberculin PPD as antigen, has been assayed in a trial series of 124 tuberculous and 139 non-tuberculous patients. The stability of the antigen preparation, and the omission of an adsorption procedure for the removal of isoagglutinins facilitated the performance of the test. The results indicate that the technique warrants further trial as a diagnostic criterion of infection tuberculosis.

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