Abstract
1. (1) A simple method of preparing a purified antigen for the complement-fixation test for kala-azar from the alcoholic extract of Kedrowsky's bacillus has been described. 2. (2) The preparation of the antigen by the present method is very simple and can easily be carried out. 3. (3) The material obtained by this method not only possesses high antigenic activity but is also practically non-anticomplementary.

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