A nurse points to an Electrocardiograph (EKG) machine with a copper pen next to a copper IV drip stand at the Copper Hospital in Calama city, north of Santiago March 31, 2011. A clinical trial at the Intensive Care Unit of the Copper Hospital in the mining city, which uses copper applications such as bed rails, bedside tables, handrests and IV drip stands, has showed that anti-bacterial copper quality on copper surfaces killed up to 92 percent of bacteria, according to Copper Hospital. Picture taken March 31, 2011. REUTERS/Ivan Alvarado (CHILE - Tags: SOCIETY ENVIRONMENT HEALTH)