1. Epidemiology Department; New Haw, Addlestone Surrey KT15 3NB
2. Department of Bacterial Diseases; Veterinary Laboratories Agency; New Haw, Addlestone Surrey KT15 3NB
3. Exotic Diseases Team; State Veterinary Service; DEFRA; Area 204, 1A Page Street London SW1P 4PQ
4. Veterinary Laboratories Agency; Barton Hall, Garstang Road Preston PR3 5HE
5. Laboratory of Enteric Pathogens; PHLS; Colindale London NW9 5HT