▁col i ▁micro bes ▁are ▁killed ▁after ▁just ▁ 1 – 2 ▁hours ▁on ▁co pper . ▁On ▁st ain less ▁steel ▁surfaces , ▁the ▁micro bes ▁can ▁surv ive ▁for ▁weeks . ▁ ▁Results ▁of ▁E . ▁col i ▁O 1 5 7 : H 7 ▁destruction ▁on ▁an ▁al loy ▁containing ▁ 9 9 . 9 % ▁co pper ▁( C 1 1 0 0 0 ) ▁demonstrate ▁that ▁this ▁path ogen ▁is ▁rapidly ▁and ▁almost ▁completely ▁killed ▁( over ▁ 9 9 . 9 % ▁kill ▁rate ) ▁within ▁nin ety ▁minutes ▁at ▁room ▁temperature ▁( 2 0   ° C ). ▁At ▁ch ill ▁temper atures ▁( 4   ° C ), ▁over ▁ 9 9 . 9 % ▁of ▁E . ▁col i ▁O 1 5 7 : H 7 ▁are ▁killed ▁within ▁ 2 7 0 ▁minutes . ▁E . ▁col i ▁O 1 5 7 : H 7 ▁destruction ▁on ▁several ▁co pper ▁allo ys ▁containing ▁ 9 9 % – 1 0 0 % ▁co pper ▁( including ▁C 1 0 2 0 0 , ▁C 1 1 0 0 0 , ▁C 1 8 0 8 0 , ▁and ▁C 1 9 7 0 0 ) ▁at ▁room ▁temperature ▁begins ▁within ▁minutes . ▁At ▁ch illed ▁temper atures , ▁the ▁in activ ation ▁process ▁takes ▁about ▁an ▁hour ▁longer . ▁No ▁significant ▁reduction ▁in ▁the ▁amount ▁of ▁vi able ▁E . ▁col i ▁O 1 5 7 : H 7 ▁occurs ▁on ▁st ain