1. Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
2. Wellcome Trust Sanger Institute, Hinxton, UK
3. Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
4. Department of Clinical Microbiology, Slagelse Sygehus, Denmark
5. Moredun Research Institute, Penicuik, UK
6. Department of Clinical Medicine, University of Cambridge, Cambridge, UK