1. Canadian Cooperative Wildlife Health Centre, Department of Pathology and Microbiology, College of Veterinary Medicine, University of Montreal, 3200 Sicotte, C.P. 5000, Saint Hyacinthe, Quebec J2S 7C6, Canada
2. Groupe de Recherches sur les Maladies du Porc, College of Veterinary Medicine, University of Montreal, 3200 Sicotte, C.P. 5000, Saint Hyacinthe, Quebec J2S 7C6, Canada