1. Comparative Pathology Laboratory, Division of Veterinary Pathology, Infection and Immunity, Department of Clinical Veterinary Science, University of Bristol Veterinary School, Langford House, Langford, Bristol BS40 5DU, UK
2. Kafkas Universitesi, Veteriner Fakultesi, Patoloji A.B.D., 36300 Kars, Turkey
3. Brynhyfryd, Swansea SA4 9LQ, UK