| Affiliation: | 1. A.R.C. Institute for Research on Animal Diseases, Compton, Nr. Newbury, Berks. RG16 ONN Great Britain;2. Edward Grey Institute of Field Ornithology, Department of Zoology, South Parks Road, Oxford. OX1 3PS Great Britain;1. Department of Animal and Poultry Science, University of Saskatchewan, 6D34 Agriculture Building, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8;2. Department of Veterinary Pathology, University of Saskatchewan, 6D34 Agriculture Building, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8;3. Department of Plant and Animal Sciences, Nova Scotia Agricultural College, Truro, NS, Canada B2N 5E3;4. Department of Small Animal Clinical Sciences, VMRCVM, Virginia Tech, Phase II Duckpond Dr. Blacksburg, VA 24061, USA |
