1. Section of Paediatric Infectious Diseases, Department of Infectious Disease, Imperial College London, London, UK
2. Department of Pathology, Animal and Plant Health Agency, Addlestone, UK
3. Centre for Emerging, Endemic and Exotic Diseases, Pathobiology and Population Sciences, Royal Veterinary College, Hartfield, UK
4. Department of Microbiology, Facultad de Medicina Universidad de Zaragoza, Zaragoza, Spain
5. MRC Centre for Molecular Bacteriology and Infection, Department of Infectious Disease, Imperial College London, London, UK