1. National Reference Laboratory for Clostridium difficile. Leiden University Medical Center, Leiden, The Netherlands
2. National Reference Center for Clostridium difficile, Saint-Antoine Hospital, Paris, France
3. Anaerobe Reference Laboratory, National Public Health Service for Wales Cardiff, University Hospital of Wales, Cardiff, United Kingdom
4. Department for Infectious Disease Epidemiology, Robert Koch Institute, Berlin, Germany
5. Epidemiology Unit, Scientific Institute of Public Health, Brussels, Belgium
6. Centre for Food Safety, Food Science and Veterinary Medicine, University College Dublin, Dublin, Ireland
7. Health Protection Surveillance Centre and Beaumont Hospital, Dublin, Ireland
8. Health Protection Scotland, Section for Healthcare Associated Infection and Infection Control, Glasgow, United Kingdom
9. Scottish Clostridium difficile Reference Service, Stobhill Hospital, Glasgow, United Kingdom
10. Department of Medical Microbiology, Medical University of Warsaw, Warsaw, Poland
11. Division of Microbiology, National Public Health Laboratory, Luxembourg
12. Division of Infectious diseases and Hospital Epidemiology, University Hospital, Basel, Switzerland
13. National Reference Laboratory for Enteropathogens, Statens Serum Institut, Copenhagen, Denmark
14. Österreichische Agentur für Gesundheit und Ernährungssicherheit (Austrian Agency for Health and Food Safety; AGES), Vienna, Austria
15. Centrum Infectieziektebestrijding (Centre for Infectious Disease Control; CIb), Rijksinstituut voor Volksgezondheid en Milieu (National Institute for Public Health and the Environment; RIVM), Bilthoven, The Netherlands
16. Microbiology Department, Saint-Luc University Hospital, Brussels, Belgium
17. Departement of Infectious Diseases, Institut de Veille Sanitaire (National Public Health Institute; InVS), Saint-Maurice, France
18. Clostridium difficile Ribotyping Network for England (CDRNE), Health Protection Agency, Reference Leeds General Infirmary, Leeds, United Kingdom
19. Health Protection Agency, London, United Kingdom
20. Microbiology Laboratory, University Hospital, Basel, Switzerland
21. Department of Clinical Microbiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
22. Department of Medical Microbiology, University General Hospital Gregorio Maranon, Madrid, Spain
23. Smittskyddsinstitutet (Swedish Institute for Infectious Disease Control; SMI), Solna, Sweden
24. Kansanterveyslaitos (National Public Health Institute; KTL), Helsinki, Finland
25. Department of Infection Prevention, Rikshospitalet, Oslo, Norway
26. Health Protection Agency, Communicable Disease Surveillance Centre (Northern Ireland), Belfast, United Kingdom
27. Microbiology Laboratory Belfast City Hospital, Belfast, United Kingdom
28. Medical Microbiology, Centre for Infectious Diseases, University of Edinburgh College of Medicine and Veterinary Medicine, Edinburgh, United Kingdom
29. European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden