Group A streptococcus.

  title={Group A streptococcus.},
  author={Judith Marie Martin and Michael Green},
  journal={Seminars in pediatric infectious diseases},
  volume={17 3},
Group A streptococci (GAS) are gram positive cocci that can be divided into more than 100 M-serotypes or emm types based on their M proteins. Their virulence is related directly to the M protein on the cell surface that inhibits phagocytosis. Although it is more commonly thought of in the context of causing clinical illness, Streptococcus pyogenes can colonize the pharynx and skin. Infections due to GAS include pharyngitis, impetigo, ecthyma, erysipelas, and cellulitis. These infections, as… CONTINUE READING