Abstract
Summary
A skin test antigen for toxoplasmosis was prepared by liberation of the intracellular organisms and separation of the toxoplasma from the cellular debris. Standardization by count showed that an antigen of 1-11/2 million organisms per ml produced skin reactions of a desirable clinical range. This standard antigen produced skin tests resulting in 95% correlation with the dye test when a minimum of 7 mm of either erythema or induration was required for a positive reaction.
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