1. Clinic of Companion Animal Medicine (Rallis, Mylonakis, Petanides, Koutinas) and the Clinic of Surgery (Patsikas, Papazoglou), School of Veterinary Medicine, Aristotle University of Thessaloniki, 11, St Voutyra str, 54627 Thessaloniki, Greece and the
2. Division of Veterinary Pathology, Infection and Immunity (Day), School of Clinical Veterinary Science, University of Bristol, Langford, BS40 5DU United Kingdom
3. From the