group a streptococcus treatmentstreptococcus anginosus groupgroup beta streptococcusgroup b streptococcus treatmentstreptococcus agroup a beta hemolytic streptococcusgroup g streptococcusgroup c streptococcusviridans group streptococcigroup a streptococcal infectiongroup b streptococcus pregnancybeta streptococcus group b