1. Institute of Hygiene, University Hospital Münster, Münster, Germany
2. National Consulting Laboratory for Hemolytic Uremic Syndrome, University Hospital Münster, Münster, Germany
3. Department of Periodontology and Operative Dentistry, University Hospital Münster, Münster, Germany
4. Department of Microbiology, Infection Protection, Hospital Hygiene, and Infection Epidemiology, Public Health Agency of Lower Saxony, Hannover, Germany
5. Department of Enteropathogenic Bacteria and Legionella, National Reference Center for Salmonella and other Bacterial Enteric Pathogens, Robert Koch Institute, Wernigerode, Germany
6. Department of Biological Safety, National Reference Laboratory for Escherichia coli Including VTEC, German Federal Institute for Risk Assessment, Berlin, Germany