1. Department of Infectious Disease Epidemiology, Faculty of Medicine, Imperial College London, St. Mary's Hospital, London W2 1PG, Molecular Infectious Diseases Group, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford OX3 9DS, Department of Medical Microbiology, The Royal Free Hospital, London NW3 2QG, and Laboratory of Hospital Infection, Central Public Health Laboratory, London NW9 5HT, United Kingdom, and Veterinary Hospital, Ocean Park Corporation, and Departments of...