Prof. Hans Bärlocher left the hospital after a long working day. Outside the building, he took a deep breath of fresh Spring air; then, he smelled his right hand. Yes, it had the faint, but typical copper smell. This reassured him that he had not pick up any germs when going through the series of doors to leave the clinic. All the doors in his hospital had recently been refitted with door handles and push plates of antimicrobial copper. Also, many other items of stainless steel, like trays, bed rails, bathroom fixtures or toilet seats had been replaced by corresponding