group a streptococcus treatmentstreptococcus pyogenes descriptionstreptococcus pyogenes infectionbacteria streptococcus pyogenesbacitracin streptococcus pyogenesdefine streptococcus pyogenesstreptococcus anginosus groupgroup a streptococcus bacteriastreptococcus pyogenes aerobics pyogenesstreptococcus pyogenes agarstreptokok pyogenes