1. The Roslin Institute and Centre for Infectious Diseases, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Edinburgh, Scotland, United Kingdom
2. Centro de Investigación y Tecnología Animal, Instituto Valenciano de Investigaciones Agrarias, Castellón, Spain
3. Institute of Evolutionary Biology, Ashworth Laboratories, University of Edinburgh, Edinburgh, Scotland, United Kingdom
4. University of Mississippi Medical Center, Jackson, Mississippi
5. Department of Microbiology, School of Genetics and Microbiology, Moyne Institute of Preventive Medicine, University of Dublin, Trinity College, Dublin, Ireland
6. Department of Cellular & Molecular Medicine, St George’s Hospital Medical School, University of London, London, United Kingdom