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Often described by 5% sheep blood agar hemolysis (1902) or. Lancefield simplified the classification of streptococci by showing that surface antigens (carbohydrates) extracted from the cell wall of streptococci could react with carbohydrate. Nomenclature and taxonomy of streptococci confusing because of many historical efforts at describing the class.

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Lancefield in 1933, distinguishes more than 20 groups of streptococci.

† enterococci were initially included among the group d streptococci but are now classified as a separate genus even though they do express lancefield group d antigens.

This classification, which dates back to the biologist rebecca c. The species are put under the mitis group of streptococci on the basis of their 16s rrna gene sequences and nucleic acid hybridization data.