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Streptococcus Pyogenes
Streptococcus pyogenes is a spherical gram-positive bacteria that grows in long chains and is the cause of Group A streptococcal infections. S. pyogenes displays group A antigen on its cell wall and beta-hemolysis when cultured on blood agar plate. S. pyogenes typically produces large zones of beta-hemolysis, the complete disruption of erythrocytes and the release of hemoglobin, and it is therefore called Group A (beta-hemolytic) Streptococcus (abbreviated GAS). Streptococci are catalase-negative.
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