1. From the Departments of Microbiology and Immunology, Surgery and Physiology, University of Newcastle upon Tyne and Department of Microbiology, Freeman Hospital, Newcastle upon Tyne, Academic Urology Unit, Medical School, Aberdeen University, Aberdeen and Zoonotic and Animal Pathogens Research Laboratory, Medical Microbiology, University of Edinburgh, Edinburgh, United Kingdom, and Institute for Molecular Biology of Infectious Diseases, University of Wurzburg, Wurzburg, Germany