University of Kentucky College of Agriculture, Food & Environment


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Eugene T. Lyons, PhD
(859) 218-1115

Department of Veterinary Science
M.H. Gluck Equine Research Center
College of Agriculture, Food & Environment
University of Kentucky

Birth Date

6 May 1931 – Yankton, SD


South Dakota State University, Brookings, SD– Zoology (Wildlife; Agriculture) BS – 1956

Kansas State University, Manhattan, KS – Zoology (Parasitology) MS – 1958

Colorado State University, Fort Collins, CO – Zoology (Parasitology) PhD – 1963

Military Service

U.S. Coast Guard – 1950-1953

University Employment

Kansas State University, Graduate Research Assistant, 1956-1958

University of Kentucky, Assistant Professor of Animal Pathology, 1958-1960

Colorado State University, Graduate Research Assistant, 1960-1963

University of Kentucky, Assistant Professor of Veterinary Science, 1963-1970

University of Kentucky, Associate Professor of Veterinary Science, 1970-1977

University of Kentucky, Professor of Veterinary Science, 1977-present


American Society of Parasitologists

American Association of Veterinary Parasitologists

Helminthological Society of Washington

World Association for Advancement of Veterinary Parasitology

Wildlife Disease Association

Southeastern Society of Parasitologists

Kentucky Academy of Science


Thomas Poe Cooper Award (Univ. of KY Research award) – 1976

Distinguished Veterinary Parasitologist (American Association of Veterinary Parasitologists) – 1991 (co-awardee – J. H. Drudge)

Honorary Member

Kentucky Veterinary Medical Association

Recent Publications

Lyons, E.T. and Tolliver, S.C. Prevalence of parasite eggs (Strongyloides westeri, Parascaris equorum, and strongyles) and oocysts (Eimeria leuckarti) in the feces of Thoroughbred foals on 14 farms in central Kentucky in 2003. Parasitol. Res 92:400-404, 2004.

Spraker, T.R., Lyons, E.T., DeLong, R.L., and Zink, R.R. Penetration of the small intestine of a California sea lion (Zalophus californianus) pup by adult hookworms (Uncinaria spp).Parasitol. Res. 92:436-438, 2004.

Kaplan, Ray M., Klei, Tom R., Lyons, Eugene T., Lester, Guy, Courtney, Charles H., French, Dennis D.  Tolliver, Sharon C., Vidyashankar, Anand, N., and Zhao, Ying.  Prevalence of Anthelmintic resistant cyathostomes on horse farms.  JAVMA 225: 903-910, 2004.

Lyons, E.T. and DeLong, R.L.  Photomicrographic images of some features of Uncinaria spp (Nematoda: Ancylostomatidae) from otariid pinnipeds.  Parasitol. Res. 95: 346-352, 2005.

Lyons, E.T.  Historic importance of some aspects of research by O. Wilford Olsen on hookworms (Uncinaria lucasi) in northern fur seals (Callorhinus ursinus) and Steller sea lions (Eumatopias jubatus) in 1951 on St. Paul Island, Alaska.  Parasitol. Res. 95: 353-357, 2005.

Tandon, R., Lyons, E. T., Tolliver, S. C.,  and Kaplan, R. M.  Effect of moxidectin selection on the genetic variation within Cylicocyclus nassatus based on amplified fragment length polymorphism (AFLP).  Int. J. Parasitol. 35: 813-819, 2005.

Lyons, E. T., DeLong, R. L., Spraker, T. R., Melin, S. R., Laake, J. L., and Tolliver, S .C.  Seasonal prevalence and intensity of hookworms (Uncinaria spp.) in California sea lion (Zalophus californinus) pups born in 2002 on San Miguel Island, California.  Parasitol. Res. 96: 127-132, 2005.

Acevedo-Whitehouse, K, Spraker, T. R., Lyons, E., Melin, S. R., Gulland, F., DeLong, R. L., and Amos, W.  Contrasting effects of heterozygosity on survival and hookworm resistance in California sea lion pups.  Molecular Ecology 15: 1973-1982,

Castinel, A., Duignan, P. J., Pomroy, W. E., Lyons, E. T., Nadler, S.A.,  Dailey, M. D., Wilkinson, L. S., and Chilvers, B. L.  First report and characterization of adult Uncinaria spp. in New Zealand sea lion (Phocarctos hookeri) pups from the Auckland Islands, New Zealand.  Parasitol. Res. 98: 304-309, 2006.

Lyons, E. T., Tolliver, S. C., and Collins, S. S.  Field studies on endoparasites of Thoroughbred foals on seven farms in central Kentucky in 2004.  Parasitol. Res. 98: 496-500, 2006.

Lyons, E. T., Tolliver, S. C., and Collins, S. S.  Prevalence of large endoparasites at necropsy in horses infected with Population B small strongyles in a herd established in Kentucky in 1966.  Parasitol. Res. 99: 114-118, 2006.

Bryant, U. K., Lyons, E. T., Bain, F. T. and Hong, C. B.  Halicephalobus gingivalis-associated meningoencephalitis in a Thoroughbred foal. J. Vet. Diag. Invest. 18: 612--615, 2006.

Lyons, E. T., Tolliver, S. C., Drudge, J. H., and Coleman, R. J.   Controlling Internal Parasites of the Horse.  Vet. 1, Revised 2006.

Lyons, E. T., Tolliver, S. C., Drudge, J. H., and Collins, S. S.  Tapeworms in Horses.  Vet 32, Revised 2006.

Lyons, E. T., Tolliver. S. C., Rathgeber, R. A., and Collins, S. S.   Parasite field study in central Kentucky on Thoroughbred foals (born in 2004) treated with pyrantel tartrate daily and other parasiticides periodically.  Parasitol. Res. 100: 473-478, 2007.       

Castinel, A., Duignan, P. J., Lyons, E .T., Pomroy, W. E., Lopez-Villalobos, N., Wilkinson, L. S., Chilvers, B. L., Gibbs, N.  Epidemiology of  hookworm (Uncinaria spp) infection n New Zealand (Hooker’s) Sea Lions (Phocarctos hookeri) pups on Enderby Island, Auckland Islands (New Zealand) during the breeding seasons from 1999/2000 to 2004/2005.  Parasitol. Res. 101: 53-62, 2007.

Spraker, T. R., DeLong, R. L., Melin, S. R., and Lyons, E. T.  Hookworm enteritis with bacteremia in California sea lion pups on San Miguel Island.  J. Wildlife Dis. 43: 179-188, 2007. 

Lyons ET., Tolliver SC. Collins, S.S. Study (1991 to 2001) of drug-resistant Population B small strongyles in critical tests in horses in Kentucky at the termination of a 40-year investigation. Parasitol. Res. 101:689-701, 2007.

Lyons ET, Tolliver SC, Ionita M, Lewellen A, Collins SS. Field studies indicating reduced activity of ivermectin on small strongyles in horses on a farm in Central Kentucky. Parasitol Res. 103:209-215, 2008

Lyons ET, Tolliver SC, Ionita M, Collins SS. Evaluation of parasiticidal activity of fenbendazole, ivermectin, oxibendazole, and pyrantel pamoate in horse foals with emphasis on ascarids (Parascaris equorum) in field studies on five farms in Central Kentucky in 2007.Parasitol Res.103:287-291, 2008.

Ionita M, Varela MG, Lyons ET, Spraker TR, Tolliver SC. Hookworms (Uncinaria lucasi) and acanthocephalans (Corynosoma spp. and Bolbosoma spp.) found in dead northern fur seals (Callorhinus ursinus) on St. Paul Island, Alaska in 2007. Parasitol Res.103:1025-1029,.2008

Lyons ET, Tolliver SC, Collins SS. Probable reason why small strongyle EPG counts are returning “early” after ivermectin treatment of horses on a farm in Central Kentucky. Parasitol. Res. 104:569-574, 2009

Lyons, ET, Tolliver, S.C. Some Historic Aspects of Small Strongyles and Ascarids in Equids  Featuring Drug Resistance with Notes on Ovids-Emphasis on Research at the University of Kentucky.  SR-102 (Bulletin) Agricultural Experiment Station, University of Kentucky College of Agriculture, Lexington, KY, 40546  (2009)  

Yeargan MR, Lyons ET, Kania SA, Patton S, Breathnach CC, Horohov DW, Howe DK. Incidental isolation of Setaria equina microfilariae in preparations of equine peripheral blood mononuclear cells. Vet Parasitol. 161(1-2):142-145. 2009.

Delong, R.L., Orr, A .J., Jenkinson, R.S., Lyons, E.T. Treatment of northern fur seal (Callorhinus ursinus) pups with ivermectin reduces hookworm-induced mortality. Marine Mammal Science. 25 (4):944-948. 2009.

Ionita, Mariana, Howe, Daniel K, Lyons, Eugene T., Tolliver, Sharon C., Kaplan, Ray M. Mitrea, Ioan Liviu, Yeargan, Michelle. Use of a reverse line blot assay to survey small strongyle (Strongylida: Cyathostominae) populations in horses before and after treatment with ivermectin.  Veterinary Parasitology 168: 332–337, 2010.                                                                  

Lyons, E.T., Ionita, M.,Tolliver, S.C.  Important gastrointestinal parasites.  In A.O. McKinnon, E.L. Squires, W.E. Vaala and D.D. Varner (Eds), Equine Reproduction.  Blackwell Publishing, pp. 292-301, 2010.

Rossano M.G, Smith, A.R., Lyons, E.T. Shortened strongyle-type egg reappearance periods in naturally infected horses treated with moxidectin and failure of a larvicidal dose of fenbendazole to reduce fecal egg counts  Veterinary Parasitology (Published On Line July 9 2010)

Lyons , Eugene T., Tolliver, Sharon C., Kuzmina, Tetiana A., Collins, Sandra S. Critical tests evaluating efficacy of moxidectin against small strongyles in horses from a herd for which reduced activity had been found in field tests in Central Kentucky. Parasitology Research (Published On Line August 16, 2010).

Nielsen, M.K., . K.E. Baptiste,K.E.,  S.C. Tolliver, S.C., Collins, S.S., Lyons, E.T. Analysis of multiyear studies in horses in Kentucky to ascertain whether counts of eggs and larvae per gram of feces are reliable indicators of numbers of strongyles and ascarids present . Veterinary Parasitology (Published On Line August 17, 2010)

Lyons, E.T., Tolliver, S.C.,  Collins, S.S., Ionita, M., Kuzmina, T.A., Rossano, M.  Field tests demonstrating reduced activity of ivermectin and moxidectin against small strongyles in horses on 14 farms in Central Kentucky in 2007 – 2009. Parasitology Research (Published On Line on September 23, 2010)

Lyons, E.T., Tolliver, S.C., Collins, S.S. Reduced activity of moxidectin and ivermectin on small strongyles in young horses on a farm (BC) in Central Kentucky in two field tests with notes on variable counts of eggs per gram of feces (EPGs) (Submitted  to Parasitology Research on July 10, 2010)

Lyons, Eugene T., Kuzmina, Tetiana A., Tolliver, Sharon C.,Collins. S.S. Observations on development of natural infection and species composition of small strongyles in young equids in Kentucky (Submitted to Parasitology Research on August 24, 2010)

Kuzmina, T.A., Tolliver, S.C.,  Lyons, E.T.  Three recently recognized species of cyathostomes (Nematoda: Strongylidae) in equids in Kentucky (Submitted to Parasitology Research on September 19, 2010)   

Lyons, E.T., DeLong. R.L., Nadler, S.A., Laake, J.L., Orr, A.J., DeLong, B.L., Pagan, C. Investigations of peritoneal and intestinal infections of adult hookworms (Uncinaria spp.) in northern fur seal (Callorhinus ursinus) and California sea lion (Zalophus californianus) pups on San Miguel Island, California (2003) (Submitted to Parasitology Research on September 20, 2010)

Research Interests

Major interest is on internal parasites of horses, sheep, and cattle. Also, wildlife, especially pinnipeds, internal parasites have been and are being studied. Major emphasis is on transmission, life cycles, treatment, and prevalence.


Maxwell H.Gluck Equine Research Center
Department of Veterinary Science, University of Kentucky
Lexington, Kentucky 40546-0099

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