1. Centre for Animal Parasitology, Canadian Food Inspection Agency, 116 Veterinary Road, Saskatoon, Saskatchewan, Canada S7N 2R3
2. Fisheries and Oceans Canada, Central and Arctic Region, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6
3. Fisheries and Oceans Canada, Maurice Lamontagne Institute, 850 Route de la Mer, Mont-Joli, Quebec, Canada G5H 3Z4
4. United States Department of Agriculture, Animal and Plant Health Inspection Service, National Veterinary Services Laboratories, 1800 Dayton Road, Ames, Iowa 50010, USA