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Uptodate Reference Title
Streptococcus pyogenes on blood agar
Streptococcus pyogenes on blood agar
Culture of Streptococcus pyogenes on blood agar showing large zones of clear beta-hemolysis around the small colonies. The susceptibility of this organism to bacitracin is demonstrated by the zone of inhibition around the bacitracin-containing disc (A) on the left side of the plate.