1. Public Health England, 61 Colindale Avenue, London NW9 5EQ, UK
2. Animal Laboratories and Plant Health Agency, Woodham Lane, Surrey KT15 3NB, UK
3. Scottish E. coli O157/VTEC Reference Laboratory, Department of Laboratory Medicine, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, UK
4. Future Farming Systems, R&D Division, SRUC, Drummondhill, Stratherrick Rd., Inverness IV2 4JZ, Scotland, UK
5. Centre for Immunity, Infection and Evolution, Kings Buildings, University of Edinburgh, Edinburgh EH9 3FL, UK
6. Division of Infection and Immunity, The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin EH25 9RG, UK
7. University of East Anglia, Norwich NR4 7TJ, UK