Immunochemical Relationship between Streptococcus MG, F III and Streptococcus salivarius

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Abstract
The identity of the poly-saccharide antigens of Streptococcus MG and streptococci with group antigen-F and type antigen-III is shown by precipitation reactions with formamide extracts, cross-absorption tests, sugar composition and by the inhibition of the quantitative precipitation reaction. On this basis Streptococcus MG can be classified as an F-III strain. The relationship between Streptococcus MG and Streptococcus salivarius type-I is explained by their common reactions with anti-III serum. Inhibition of the quantitative precipitations with simple sugars suggest that the determinant groups of the type-III and the "salivarius" antigen are not quite identical, although both antigens contain a [beta]-glucosidic and a galactosidic group. A second unrelated antigen has been found in some "salivarius" strains alone (represented by strain-51) or together with type-III antigen. The quantitative precipitation of the strain 5l/anti-strain-51 system was only slightly inhibited by rhamnose. The qualitative composition of the sugar components of the formamide extracts of Streptococcus MG, F-III, both "salivarius" types of 0-III are compared.