[Investigation comparing the methods of serological differentiation of streptococci by precipitation, co-agglutination and fluorescence test (author's transl)].

Three methods for the serological determination of streptococci were compared: immunoprecipitation, immunofluorescence and co-agglutination. The results of the immunoprecipitation were the basis of evaluation. The deviating results in immunofluorescence and co-agglutination deviate among one another. With immunofluorescence relatively too many strains were determined as group B, with co-agglutination as group C.