"It only affects bacteria" ... today, but it will mutate. Kind of like the mad idea of unloading uncontrolled nano-bots on the environment. Now if you can find a way to kill targeted bacteria, and it can't mutate ... that would be cool. Nano-bots might be the solution, provided you don't build self-modifying nano-bots. I mean, if you want to kill bacteria (and you aren't phobic like Howard Hughes), just use bleach. Some people will die form the bleach, but maybe more will die from infections. I know that bleach can't mutate into something else. WE like high-tech solutions too much, that backfire on us. The biggest thing that would clean up hospitals, is adopting Japanese culture. Face masks for everyone, and take your damn dirty shoes off a the entrance. Our housecleaners have to fight random dirt brought in every day on people's shoes, staff and patients. See, we could end all these iatrogenic deaths .. if we treated the whole hospital as a ICU ... but it costs too much, and people's lives aren't worth much.