1. Department of Veterinary Clinical Sciences; Royal Veterinary College; Department of Veterinary Clinical Sciences; Hawkshead Lane, Hatfield, North Mymms Hertfordshire AL9 7TA UK
2. Department of Pathology and Infectious Diseases; Royal Veterinary College; Department of Veterinary Clinical Sciences; Hawkshead Lane, Hatfield, North Mymms Hertfordshire AL9 7TA UK