Abstract
Summary
The results of the 2 tests, precipitation and complement-fixation, paralleled one another so closely with this highly purified soluble specific substance of Type I pneumococcus that the reactions appear to represent union of the same antigen and antibody. The comparative titration of complement, however, is the more sensitive measure of the specific activity of an immune serum. Within the zone of optimum reactivity the amount of complement fixed was directly proportional to the amount of immune serum present.
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