1. 1Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
2. 2Department of Zoology, University of Oxford, Oxford, United Kingdom
3. 3Clinical Microbiology, University of Iceland and Landspitali University Hospital, Reykjavik, Iceland
4. 4Department of Microbiology and Infection Control, Statens Serum Institut, Copenhagen, Denmark
5. 5Pathogen Genomics, Wellcome Trust Sanger Institute, Hinxton, United Kingdom