A Quantitative Complement Fixation Test: Titration of Luetic Sera by the Unit of 50 Per Cent Hemolysis

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Abstract
Summary: A quantitative complement fixation test employing the unit of 50 per cent hemolysis has been described in detail. In practice the test proved highly sensitive, specific and relatively simple to carry out. Only two 50 per cent hemolytic units were used. This contrasts with the multiple 50 per cent units recommended by other investigators. The underlying advantages and possible applications of the test have been discussed.