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