hemolytic streptococcus

hemolytic streptococcus
any streptococcus capable of hemolyzing red blood cells or of producing a zone of hemolysis around the colonies on blood agar; the great majority of streptococci found in pathologic processes are of this type. They have been classified as the α-hemolytic type, which produces around the colony on blood agar a small greenish zone (see also viridans s.); and the β-hemolytic type, which produces around the colony on blood agar a clear zone of hemolysis that is larger than that of the α type.

Medical dictionary. 2011.

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