[On the biological activity of Escherichia strains, with special reference to fimbriae (author's transl)].

According to the results of earlier investigations of other authors, there are differences between Escherichia-strains fron urinary tract infections and fron the feces of healthy persons with regard to their biochemical, hemolytic, necrotizing and pathogenic properties in mice experiments. Hemolytic Escherichia cultures are very different from non - hemolytic cultures in their necrotizing and pathogenic behaviour. In contrast to Escherichia-strains from the feces of healthy persons strains from urinary tract infections have fimbriae to a much greater extent and hemolytic strains up to 100%.