Production of Specific Group N Precipitating Sera for Streptococcus cremoris by ‘Absorption’ of Non-specific Antigens

Abstract

DUE in part to the difficulty of preparing a specific group N precipitating serum for Streptococcus cremoris, the boundaries and constituents of serological group N have been so far incompletely determined. Although, by means of serological methods using interfacial precipitin tests with hydrochloric acid extracts, Str. cremoris has been grouped with Streptococcus lactis by Shattock and Mattick¹, and with Str. lactis and with Streptococcus diacetilactis by Swartling², final confirmation of its serological identity with group N must depend on the preparation of a specific group serum for Str. cremoris itself.