1. Food-borne pathogens and typing, Department of Microbiological Surveillance and Research, Statens Serum Institut, Copenhagen, Denmark
2. World Health Organization Collaborating Centre for Reference and Research on Escherichia and Klebsiella, Department of Microbiological Surveillance and Research, Copenhagen, Denmark
3. Department of Clinical Microbiology, Hillerød Sygehus, Hillerød, Denmark
4. European Union Reference Laboratory for Escherichia coli, Department of veterinary public health and food safety, Istituto Superiore di Sanità, Rome, Italy
5. University of Virginia School of Medicine, Charlottesville, United States