University of Saskatchewan

Western College of Veterinary Medicine

Polley, Lydden

Veterinary Microbiology
Office Location: WCVM 7220
Phone: 306-966-7220
Fax: 306-966-7244

Academic Credentials

Research Interests

Recent research has been concerned with the ecology of parasites of domestic animals, wildlife and people in Canada. This especially includes parasitic infections in keystone arctic wildlife, the potential impacts of global warming on northern host-parasite dynamics, and parasitic zoonoses. 

Research in the Arctic is co-ordinated through the Research Group for Arctic Parasitology (RGAP) that was established at the WCVM in 1994. Since 2005, RGAP has been centred with Dr Susan Kutz, associate professor, Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary. 

Research at the University of Saskatchewan on parasite zoonoses in the North is centred with Dr Emily Jenkins, assistant professor of public health and food safety, Department of Veterinary Microbiology, WCVM.

Lydden Polley is Co-Editor, with Andrew Thompson of Murdoch University, of the new open access International Journal for Parasitology: Parasites and Wildlife (IJP:PAW), and in 2011 was the recipient of the World Association for the Advancement of Veterinary Parasitology (WAAVP) - Bayer Award for Excellence in Teaching.


Jenkins, E.J., Castrodale, L.J., de Rosemond, S.J.C., Dixon, B.R., Elmore, S.A., Gesy, K.M., Hoberg, E.P., Polley, L., Schurer, J.M., Simard, M., Thompson, R.C.A., 2013. “Tradition and Transition: Parasitic Zoonoses of People and Animals in Alaska, Northern Canada, and Greenland.” Advances in Parasitology 82: 33-204. (Invited Review)

J. Hoopes, L. Polley, B. Wagner, E.J. Jenkins., 2013. A retrospective investigation of feline gastrointestinal parasites in western Canada. Canadian Veterinary Journal 54:359-362.

Hoberg, E.P., Galbreath, K.E., Cook, J.A., Kutz, S.J., Polley, L., 2012. "Northern Host-Parasite Assemblages: History and Biogeography on the Borderlands of Episodic Climate and Environmental Transition." Advances in Parasitology 79: 1-97 (Invited Review)

Kutz, S.J., Ducrocq, J., Verocai, G.G., Hoar, B.M., Colwell, D.D., Beckman, K.B., Polley, L., Elkin, B.T., Hoberg, E.P., 2012. "Parasites in Ungulates of Arctic North America and Greenland: A View Of Contemporary Diversity, Ecology, and Impact in a World Under Change." Advances in Parasitology 79: 99-252 (Invited Review)

Jenkins, E., Peregrine, A., Hill, J., Somers, C., Gesy, K., Barnes, B., Gottstein, B., Polley, L., 2012. "Detection of a European Strain of Echinococcus multilocularis is North America." Emerging Infectious Diseases 18: 1010-1012.

Peregrine, A.S., Jenkins, E.J., Barnes, B., Johnson S., Polley, L., Barker, I.K., De Wolf, B., Gottstein, B., 2012.  "Alveolar Hydatid Disease (Echinococcus multilocularis) in the Liver of a Canadian Dog in British Columbia, a Newly Endemic Area." Canadian Veterinary Journal 53: 870-874.

Elmore, S.A., Jenkins, E.J., Huyvaert, K.P., Polley, L., Root, J.J., Moore, C.G., 2012. "Toxoplasma gondii in Circumpolar Wildlife and People." Vector-Borne and Zoonotic Diseases 12: 1-9. 

Polley, L., Kutz, S.J., Hoberg, E.P., 2011. "Parasite Zoonoses," in Encylopedia of Environmental Health, Five Volume Set (Nriagu, N., ed.) Oxford, Elsevier, 4: 325-345. Invited chapter.

Polley L, Hoberg E, Kutz S. 2010. "Climate change, parasites and shifting boundaries." ActaVeterinaria Scandinavica. 52(Supplement 1): 51-55. Invited Review.

Kutz SJ, Jenkins EJ, Veitch AM, Ducrocq J, Polley L, Elkin B, Lair S. 2009. "The Arctic as a model for anticipating, preventing, and mitigating climate change impacts on host-parasite interactions." Veterinary Parasitology. 163: 217-228. Invited review.

Polley L, Thompson RC. 2009. "Parasite zoonoses and climate change: molecular tools for tracking shifting boundaries." Trends in Parasitology. 25: 285-91. Invited review.

Kutz SJ, Thompson RCA, Polley L. 2009. "Wildlife with Giardia: Villain or victim and vector?" Giardia and Cryptosporidium: From Molecules to Disease. Edited by Ortega-Pierres MG, et al. Cambridge, MA: CAB International. 94-105. Invited chapter.

Polley L. 2009. "Veterinary helminthology." Encyclopedia of Life Support Systems (EOLSS), Animal and Plant Productivity section. Edited by Hudson RJ. Oxford, UK: UNESCO, EOLSS Publishers. Invited chapter.

Beck K, Conboy G, Gilleard J, Mauffete M-E, Peregrine A, Polley L, Villeneuve A, Wagner B. 2009. Canadian Guidelines for the Treatment of Parasites in Dogs and Cats. Canadian Parasitology Expert Panel (CPEP). 1-21. Prepared at the invitation of Pfizer Animal Health Canada and distributed to all veterinary practitioners in Canada

Hoberg EP, Polley L, Jenkins EJ, Kutz SJ. 2008. "Pathogens of domestic and free-ranging ungulates: global climate change in temperate to boreal latitudes across North America." OIE Revue Scientifique et Technique. 27: 511-28. Invited review.

Kutz SJ, Thompson RA, Polley L, Kandola K, Nagy J, Wielinga CM, Elkin BT. 2008. "Giardia assemblage A: human genotype in muskoxen in the Canadian Arctic." Parasites and Vectors. 1: 32-35.

Hoberg EP, Polley L, Jenkins EJ, Kutz SJ, Veitch AM, Elkin BT. 2008. "Integrated approaches and empirical models for investigation of parasitic diseases in northern wildlife." Emerging Infectious Diseases. 14: 10-17.

Kutz SJ., Asmundsson I, Hoberg EP, Appleyard GD, Jenkins EJ, Beckmen K, Branigan M, Butler L, Chilton NB, Cooley D, Elkin B, Huby-Chilton F, Johnson, Kuchboev A, Nagy J, Oakley M, Popko R, Scheer A, Simard M, Veitch A, Polley L. 2008. “Serendipitous discovery of a novel protostrongylid (Nematoda: Metastrongyloidae) in caribou (Rangifer tarandus), muskox (Ovibos moschatus), and moose (Alces americanus) from high latitudes of North America based on DNA sequence.” Canadian Journal of Zoology. 85: 1143-1156.

Jenkins EJ, Veitch AM, Kutz SJ, Bollinger TK, Chirino-Trejo JM, Elkin BT, West KH, Hoberg EP, Polley L. 2007. "Protostrongylid parasites and pneumonia in captive and wild thinhorn sheep (Ovis dalli)." Journal of Wildlife Diseases. 43: 189-205.

Jenkins EJ, Kutz SJ, Hoberg EP, Polley L. 2006. "Bionomics of larvae of Parelaphostrongylus odocoilei (Nematoda: Protostrongylidae) in experimentally-infected gastropod intermediate hosts." Journal of Parasitology. 92: 298-305.

Jenkins EJ, Veitch AM, Kutz SJ, Hoberg EP, Polley L, 2006. "Climate change and the epidemiology of protostrongylid nematodes in northern ecosystems: Parelaphostrongylus odocoilei and Protostrongylus stilesi in Dall's sheep (Ovis d. dalli)." Parasitology. 132: 387-401.

Parchoma G, Taylor SM, Naylor JM, Abutarbush SM, Lohmann K, Schwarz K, Waldner C, Porterfield S, Shmon CL, Polley L, Clark C. 2006. "Integrating human-computer interaction in veterinary medicine curricula." Enhancing Learning Through Human-Computer Interaction. Edited by MacKay E. Hershey, PA: Idea Group.

Hoberg EP, Jenkins EJ, Rosenthal B, Wong M, Erbe E, Kutz SJ, Polley L. 2005. "Caudal polymorphism and cephalic morphology among first-stage larvae of Parelaphostrongylus odocoilei (Protostrongylidae: Elaphostrongylinae) in Dall's sheep from the Mackenzie Mountains, Canada." Journal of Parasitology. 91: 1318-1325. A figure from this paper was used for the journal cover.

Jenkins EJ, Hoberg EP, Polley L. 2005. "Development and pathogenesis of Parelaphostrongylus odocoilei (Nematoda: Protostrongylidae) in experimentally infected thinhorn sheep (Ovis dalli)." Journal of Wildlife Diseases. 41: 669-682. A figure from this paper was used for the journal cover.

Kutz SJ, Hoberg EP, Polley L, Jenkins EJ. 2005. "Global warming is changing the dynamics of arctic host-parasite systems." Proceedings of the Royal Society of London, Series B, Biological Sciences. 272: 2571-2576.

Polley L. 2005. "Navigating parasite webs and parasite flow: emerging and re-emerging parasitic zoonoses of wildlife origin." International Journal for Parasitology. 35: 1279-1294. Invited review in a thematic issue of the journal: Parasitic Zoonoses - Emerging Issues.