A study on the production of enterobacterial common antigen by recently described or as-yet-undescribed species belonging to the families and was carried out by hemagglutination and hemagglutination inhibition tests with rabbit antisera specific for this antigen. All 28 strains known or presumed to belong to produced this antigen, and none of the seven strains belonging to did so. The results obtained with and species are particularly noteworthy, since they represent species which are atypical for It is suggested that the determination of the production of enterobacterial common antigen is a significant aid to classification, particularly when the assignation of a new genus or species to or to another family presents a problem.


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