1. Agriculture and Agri-Food Canada; 4902 Victoria Avenue North, P.O. Box 6000, Vineland Station Ontario L0R 2E0 Canada
2. Department of Biological Sciences; Brock University; 500 Glenridge Avenue, St. Catharines Ontario L2S 3A1 Canada
3. Centers for Disease Control and Prevention; 1600 Clifton Road NE, Mail Stop C-16 Atlanta GA 30333