A study was made to reveal serological relationships among , and in bacterial agglutination and double agar-gel diffusion tests. All antisera used for the experiments were prepared in rabbits. In agglutination tests, cross-reaction occurred only between and Acetone-precipitated material showed common antigens for three species—, and in agar-gel diffusion tests—whereas polysaccharide preparations were shown to be species-specific for each of the four organisms. acetone material reacted only with antiserum in agar-gel diffusion. antiserum, after absorption by intact organisms, failed to react with both in agar-gel diffusion and agglutination tests. The results show that has surface antigens in common only with and that , and are antigenically related.


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