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Streptococcus pyogenes beta hemolytic colonies
microscope picture gram positive cocci in chains

Streptococcus pyogenes

beta-hemolytic colonies

Streptococcus pyogenes cultivated on Columbia agar with 5% sheep blood. Cultivation 24 hours in an aerobic atmosphere, 5% CO2. Colonies are surroundend by a zone of beta-hemolysis.

Spherical or ovoid cells in chains of short to medium length (4-10 cells).