Group A

Group A
Group A -'ā n the Lancefield group of beta-hemolytic streptococci that comprises all strains of a species of the genus Streptococcus (S. pyogenes) and that includes the causative agents of pharyngitis, scarlet fever, septicemia, some skin infections (as pyoderma and erysipelas), rheumatic fever, and glomerulonephritis usu. used attributively <Group A streptococcal infections> compare GROUP B

Medical dictionary. 2011.

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