▁Category : C ensus - design ated ▁places ▁in ▁Un organ ized ▁Bor ough , ▁Al aska <0x0A> </s> ▁Stre pt oc oc cus ▁py ogen es ▁is ▁a ▁species ▁of ▁Gram - pos itive , ▁aer ot ol er ant ▁b acter ium ▁in ▁the ▁genus ▁Stre pt oc oc cus . ▁ ▁These ▁b acter ia ▁are ▁ext rac ell ular , ▁and ▁made ▁up ▁of ▁non - mot ile ▁and ▁non - sp oring ▁c oc ci . ▁ ▁It ▁is ▁clin ically ▁important ▁for ▁humans . ▁ ▁It ▁is ▁an ▁inf re quent , ▁but ▁usually ▁path ogen ic , ▁part ▁of ▁the ▁skin ▁micro bi ota . ▁ ▁It ▁is ▁the ▁pre domin ant ▁species ▁har bor ing ▁the ▁L ance field ▁group ▁A ▁ant igen , ▁and ▁is ▁often ▁called ▁group ▁A ▁Stre pt oc oc cus ▁( G AS ). ▁ ▁However , ▁both ▁Stre pt oc oc cus ▁d ys gal act iae ▁and ▁the ▁Stre pt oc oc cus ▁ang inos us ▁group ▁can ▁possess ▁group ▁A ▁ant igen . ▁ ▁Group ▁A ▁stre pt oc oc ci ▁when ▁grown ▁on ▁blood ▁ag ar ▁typically ▁produces ▁small ▁zones ▁of ▁beta - hem ol ysis , ▁a ▁complete ▁destruction ▁of ▁red ▁blood ▁cells . ▁ ▁( A ▁zone ▁size ▁of ▁ 2 – 3   mm ▁is ▁typical .) ▁ ▁It ▁is ▁thus ▁also ▁called ▁group ▁A ▁( beta - hem ol yt ic ) ▁Stre pt oc oc cus ▁( G AB HS ),