1. Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, SK S7N 5E2, Canada
2. School of Environmental Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada
3. Department of Epidemiology and Public Health, Veterinary Institute, Federal Rural University of Rio de Janeiro, Seropédica 23890-000, RJ, Brazil
4. Department of Animal Health, National Center for Animal and Plant Health, San José de las Lajas CP 32700, Mayabeque, Cuba