4 ▁different ▁co pper ▁allo ys ▁as ▁cert ified ▁ant im icro b ial ▁materials ▁that ▁have ▁public ▁health ▁benefits . ▁ ▁E . ▁col i ▁ ▁E . ▁col i ▁O 1 5 7 : H 7 ▁is ▁a ▁pot ent , ▁highly ▁inf ect ious , ▁A CD P ▁( Ad vis ory ▁Committee ▁on ▁D anger ous ▁Path og ens , ▁UK ) ▁Haz ard ▁Group ▁ 3 ▁food bor ne ▁and ▁water bor ne ▁path ogen . ▁The ▁b acter ium ▁produces ▁pot ent ▁to x ins ▁that ▁cause ▁di arr he a , ▁severe ▁ach es ▁and ▁n ause a ▁in ▁inf ected ▁persons . ▁Sym pt oms ▁of ▁severe ▁in fe ctions ▁include ▁hem ol yt ic ▁col itis ▁( blo ody ▁di arr he a ), ▁hem ol yt ic ▁u rem ic ▁synd rome ▁( k id ney ▁disease ), ▁and ▁death . ▁E . ▁col i ▁O 1 5 7 : H 7 ▁has ▁become ▁a ▁serious ▁public ▁health ▁threat ▁because ▁of ▁its ▁increased ▁inc idence ▁and ▁because ▁children ▁up ▁to ▁ 1 4 ▁years ▁of ▁age , ▁the ▁elder ly , ▁and ▁imm uno comp rom ised ▁individuals ▁are ▁at ▁risk ▁of ▁inc urr ing ▁the ▁most ▁severe ▁sympt oms . ▁ ▁E ffic acy ▁on ▁co pper ▁surfaces ▁Rec ent ▁studies ▁have ▁shown ▁that ▁co pper ▁al loy ▁surfaces ▁kill ▁E . ▁col i ▁O 1 5 7 : H 7 . ▁Over ▁ 9 9 . 9 % ▁of ▁E .