1. Division of Pathological Sciences
2. Division of Animal Production and Public Health; Institute of Comparative Medicine; University of Glasgow; Faculty of Veterinary Medicine; Glasgow G61 1QH
3. Royal Veterinary College; Hawkshead Lane, North Mymms Hatfield Hertfordshire AL9 7TA
4. Laboratories, Grange House; Sandbeck Way Wetherby West Yorkshire LS22 4YY