[1] Univ Hosp Geneva, Infect Control Programme, CH-1211 Geneva 14, Switzerland
[2] Fac Med, Geneva, Switzerland
[3] Hlth Protect Agcy, WHO Reference & Res Ctr Hosp Infect, Lab Healthcare Associated Infect, London, England
[4] WHO, World Alliance Patient Safety, CH-1211 Geneva, Switzerland
[5] WHO, Dept Epidem & Pandem Alert & Response, CH-1211 Geneva, Switzerland
[6] Inst Hyg, Div Hosp Epidemiol & Environm Hlth, Heidelberg, Germany