Lancefield classification
Lancefield classification (lans-feeld) n. a classification of the Streptococcus bacteria based on the presence or absence of antigenic carbohydrate on the cell surface. Species are classified into the groups A–S. Most species causing disease in humans belong to groups A, B, and D. [ R. C. Lancefield (1895–1981), US bacteriologist]
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Lancefield classification