The Streptococci of Lancefield's Group E; Biochemical and Serological Identification of the Haemolytic Strains

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Abstract
The non-pathogenic beta-hemolytic streptococci from milk, forming Lancefield''s group E, were physiologically defined as Streptococcus infrequens and S. subacidus. They were found to fall into 4 serological types. Fractionation with ethanol showed that both group-and type-specific fractions of these organisms are of polysaccharide nature which probably accounts for the success in using formamide extracts for the type-precipitin reactions. S. subacidus possesses 2 type antigens, only one of which is also found in S. infrequens.