1. Département de Pathologie et Microbiologie; Le Groupe de Recherche en Épidémiologie des Zoonoses et Santé Publique; Université de Montréal; 3200 Sicotte; C.P. 5000; Saint-Hyacinthe; QC; J2S 7C6; Canada
2. Wildlife Research and Development Section; Ontario Ministry of Natural Resources; Trent University; 2140 East Bank Drive; Peterborough; ON; K9J 7B8; Canada
3. Department of Geography; Queen's University; Kingston; ON; K7L 3N6; Canada