▁found ▁in ▁ne on atal ▁in fe ctions . ▁ ▁In fe ctions ▁due ▁to ▁certain ▁stra ins ▁of ▁S . ▁py ogen es ▁can ▁be ▁associated ▁with ▁the ▁release ▁of ▁b acter ial ▁to x ins . ▁Th ro at ▁in fe ctions ▁associated ▁with ▁release ▁of ▁certain ▁to x ins ▁lead ▁to ▁scar let ▁fe ver . ▁ ▁Other ▁to x igen ic ▁S . ▁py ogen es ▁in fe ctions ▁may ▁lead ▁to ▁stre pt oc oc cal ▁to xic ▁shock ▁synd rome , ▁which ▁can ▁be ▁life - th re aten ing . ▁ ▁S . ▁py ogen es ▁can ▁also ▁cause ▁disease ▁in ▁the ▁form ▁of ▁post - in fect ious ▁" non - py ogen ic " ▁( not ▁associated ▁with ▁local ▁b acter ial ▁multiplication ▁and ▁p us ▁formation ) ▁synd rom es . ▁These ▁auto imm une - medi ated ▁comp lications ▁follow ▁a ▁small ▁percentage ▁of ▁in fe ctions ▁and ▁include ▁r he um atic ▁fe ver ▁and ▁ac ute ▁post - in fect ious ▁gl omer ul one ph rit is . ▁Both ▁conditions ▁appear ▁several ▁weeks ▁following ▁the ▁initial ▁stre pt oc oc cal ▁in fection . ▁ ▁R he um atic ▁fe ver ▁is ▁character ized ▁by ▁infl amm ation ▁of ▁the ▁joint s ▁and / or ▁heart ▁following ▁an ▁episode ▁of ▁stre pt oc oc cal ▁ph ary ng itis . ▁ ▁Ac ute ▁gl omer ul one ph rit is , ▁infl amm ation ▁of ▁the ▁ren al ▁gl