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Streptococcus pyogenes

Streptococcus pyogenes
Gram stain of an aspirate from a neck abscess (x1000) shows gram-positive cocci in long chains. Streptococcus pyogenes (group A Streptococcus) grew from this specimen on blood agar and tested negative by catalase.
Courtesy of Harriet Provine.
Graphic 53370 Version 4.0