[1] Western Gen Hosp, Natl CJD Surveillance Unit, Edinburgh EH4 2XU, Midlothian, Scotland
[2] Erasmus Univ, Sch Med, Dept Epidemiol & Biostat, NL-3000 DR Rotterdam, Netherlands
[3] Univ Melbourne, Dept Pathol, Parkville, Vic 3052, Australia
[4] Univ Spital Zurich, Inst Neuropathol, CH-8091 Zurich, Switzerland
[5] Inst Salud Carlos III, Ctr Nacl Epidemiol, Dept Epidemiol Aplicada, Madrid, Spain
[6] Natl Reference Ctr Slov Virus Neuroinfect, Inst Prevent & Clin Med, Bratislava 83301, Slovakia
[7] Ist Super Sanita, Virol Lab, I-00161 Rome, Italy
[8] Univ Gottingen, Dept Neurol & Neuropathol, D-3400 Gottingen, Germany
[9] Hop La Pitie Salpetriere, INSERM, U360, F-75651 Paris 13, France