Anette M Hammerum1, Frank Hansen2, Bente Olesen3, Carsten Struve4, Barbara J Holzknecht3, Paal S Andersen5, Anne-Marie Thye3, Lotte Jakobsen2, Bent L Røder6, Marc Stegger7, Dennis S Hansen3. 1. Statens Serum Institut, Copenhagen S, Denmark. Electronic address: ama@ssi.dk. 2. Statens Serum Institut, Copenhagen S, Denmark. 3. Department of Clinical Microbiology, Herlev Hospital, Copenhagen University Hospital, Herlev, Denmark. 4. Statens Serum Institut, Copenhagen S, Denmark; Collaborating Centre for Reference and Research on Escherichia and Klebsiella, Statens Serum Institut, Copenhagen, Denmark. 5. Statens Serum Institut, Copenhagen S, Denmark; Pathogen Genomics Division, Translational Genomics Research Institute (TGen), Flagstaff, AZ, USA; Veterinary Disease Biology, University of Copenhagen, Copenhagen, Denmark. 6. Department of Clinical Microbiology, Slagelse Hospital, Slagelse, Denmark. 7. Statens Serum Institut, Copenhagen S, Denmark; Pathogen Genomics Division, Translational Genomics Research Institute (TGen), Flagstaff, AZ, USA.