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