1. Department of Clinical Sciences; Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000, St-Hyacinthe Quebec Canada J2S 7C6
2. Department of Pathology and Microbiology; Faculty of Veterinary Medicine; University of Montreal; 3200 Sicotte, PO Box 5000, St-Hyacinthe Quebec Canada J2S 7C6