Abstract
1. (1) Residues from the alcoholic extract of Kedrowsky's bacillus have been shown to behave as good antigens for complement-fixation tests in kala-czar. 2. (2) A white fraction obtained from the alcoholic extract of Kedrowsky's bacillus has been found to be at least as good as the standard antigen for complement-fixation tests in kala-azar. 3. (3) Preparation of the antigen for complement-fixation tests in kala-azar from this alcoholic extract is a very much simpler procedure than the standard method of preparation of this antigen. 4. (4) The view that the antigen giving positive complement-fixation tests with sera from cases of kala-azar is contained in the alcohol-insoluble fraction of the bacilli is discussed.
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