Research
I am involved in the application of epidemiologic
principles and methods to the study of disease agents associated with
livestock and related food products. My focus is on food safety research
and animal health surveillance with a primary emphasis on beef cattle.
Much of my food safety research has been on
E. coli
O157:H7, other Shiga toxin-producing
E. coli, and
Salmonella,
but I am also involved in pre- and post-harvest food safety research on
other bacterial pathogens, antimicrobial use/resistance, and chemical
residues. My animal health surveillance work has been on the use of
clinical, diagnostic, and/or demographic data for assessing the health
status of livestock populations. We are currently focused on the
utilization of operational feedlot data for making evidence-based animal
health decisions, and believe the outcomes, including data-driven
decision support tools, will assist cattle producers in efforts to
efficiently use sparse labor resources, prudently utilize
antimicrobials, and optimize management to promote animal health and
well being. Additional research interests include the development and
application of methods for monitoring disease burden and validating
diagnostic strategies, and combining molecular and epidemiologic data
for defining the epidemiology of infectious diseases. My primary teaching role is to further develop graduate student training
in epidemiology. In addition, I am teaching a portion of the
epidemiology courses in the professional veterinary and master of public
health programs. Selected Publications: Renter D.G.*, Bohaychuk V., Van Donkersgoed J., King R. Presence of non-O157 Shiga toxin-producing Escherichia coli in Feces from Feedlot Cattle in Alberta and Absence on Corresponding Beef Carcasses. Canadian Journal of Veterinary Research; in press. Jacob M. E., Fox J.T., Drouillard J.S., Renter D.G., Nagaraja T.G.*. Effects of dried distiller’s grain on cattle fecal prevalence and growth of Escherichia coli O157 in batch culture fermentations. Applied and Environmental Microbiology; in press. Wallace J.O., Hollis L.C.*, Reinhardt C.D., Coetzee J.F., Renter D.G., Llewellyn D., Marston T.T. Failure to eliminate the carrier state of Anaplasma marginale in beef cows following multiple treatments with long-acting injectable oxytetracycline. Bovine Practitioner 2007; 41(2):84-87. Fox J.T., Renter D.G.*, Sanderson M.W., Thomson D.U., Lechtenberg K.F., Nagaraja T.G. Evaluation of culture methods to identify cattle feces with high concentrations of E. coli O157. Applied and Environmental Microbiology 2007; 73(16): 5253-5260. Renter D.G.*, Bohaychuk V., Van Donkersgoed J., King R. Presence of non-O157 Shiga toxin-producing Escherichia coli in feces from feedlot cattle in Alberta and absence on corresponding beef carcasses. Canadian Journal of Veterinary Research 2007; 71(3): 230 -235. Bohaychuk V.M., Gensler G.E., McFall M.E., King R.K., Renter D.G. A Real-Time PCR Assay for the Detection of Salmonella spp. in Food and Food-Animal Matrices. Journal of Food Protection 2007; 70: 1080-1087. Renter D.G.*, Gnad D.P., Sargeant J.M., Hygnstrom S.E. Prevalence and Serovars of Salmonella in Feces of Free-ranging Deer (Odocoileus virginianus) in Nebraska. Journal of Wildlife Diseases 2006; 42: 699-703. Sargeant J.M., Shi X., Sanderson M.W., Renter D.G., Nagaraja T.G. Pulsed-field Gel Electrophoresis Patterns of Escherichia coli O157 Isolates from Kansas Feedlots. Foodborne Pathogens and Disease 2006; 3: 251-258. Renter D.G.*, Morris J.G., Sargeant J.M., Hungerford L.L., Berezowski J., Ngo T., Williams K., Acheson D.W.K. Prevalence, Risk Factors, O-serogroups, and Virulence Profiles of Shiga toxin-producing Bacteria from Cattle Production Environments. Journal of Food Protection 2005; 68: 1556-1565. Sanderson M.W., Sargeant J.M., Renter D.G., Griffin D.D., Smith R.A. Factors Associated with the Presence of Coliforms in the Feed and Water of Feedlot Cattle. Applied and Environmental Microbiology 2005; 71: 6026-6032. Renter D.G.*,Checkley S., Campbell J., King R. Shiga Toxin-producing Escherichia coli in the Feces of Alberta Feedlot Cattle. Canadian Journal of Veterinary Research 2004; 68: 150-154. Renter D.G.*, Sargeant J.M., Hungerford L.L. Distribution of Escherichia coli O157 within and among Cattle Operations in Pasture-based Agricultural Areas. American Journal of Veterinary Research 2004; 65: 1367-1376. Renter D.G.*, Sargeant J.M., Oberst R.D., Samadpour M. Diversity, Frequency, and Persistence of Escherichia coli O157 Strains from Range Cattle Environments. Applied and Environmental Microbiology 2003; 69: 542-547. Renter D.G.*, Sargeant J.M. Escherichia coli O157: Epidemiology and Ecology in Bovine Production Environments. Animal Health Research Reviews 2002; 3: 83-94. Renter D.G.*, Sargeant J.M., Hygnstrom S.E., Hoffman J., Gillespie J.R. Escherichia coli O157:H7 in Free-ranging Deer in Nebraska. Journal of Wildlife Diseases 2001; 37: 755-760.
Selected Presentations and Published Proceedings: Renter D.G. Invited Speaker - Epidemiology of E. coli O157:H7 in Agro-ecosystems of the Midwest. Western Institute for Food Safety and Security & School of Veterinary Medicine, University of California at Davis. 2007. Renter D.G. Invited Speaker - Salmonella prevalence in feedlots. AgriLabs sponsored technical seminar at the Academy of Veterinary Consultants, Winter Meeting, 2006. Renter D.G., Oberst R.D., Sanderson M.W., Drouillard J., Thomson D.U., L. Zurek, Nagaraja T.G. Ecology of E. coli O157:H7, Non-O157 Shigatoxigenic E. coli, and Salmonella in Beef Cattle Production Systems (Poster). Proceedings of the Association of Schools of Public Health and Association of American Veterinary Medical Colleges Joint Symposium on Veterinary Public Health, 2007. Renter D.G., Alam M.J., Ives S.E., Hollis L.C., Thomson D.U., Sanderson M.W., Nagaraja T.G. Fecal shedding of Salmonella in feedlot cattle that were treated for apparent respiratory disease. Proceedings of the 87th Annual Conference of Research Workers in Animal Diseases, 2006: 57. Smith R.L., Sanderson M.W., Larson R., Renter D.G. Modeling introduction of Bovine Viral Diarrhea Virus to cow-calf herds. Proceedings of the 87th Annual Conference of Research Workers in Animal Diseases, 2006: 47. Smith R.L., Sanderson M.W., Larson R., Renter D.G. Modeling spread of Bovine Viral Diarrhea Virus in cow-calf herds. Proceedings of the 87th Annual Conference of Research Workers in Animal Diseases, 2006: 48. Renter D.G., Smith D. R., King R., Berg J., Stillborn B., McFall M. Pen-level Assessment of E. coli O157:H7 in Feedlot Cattle at Marketing for Slaughter. The 11th International Symposium of Veterinary Epidemiology and Economics, Australia. 2006: 483. Berezowski J., Checkley S., Clarke R., Patel J., Renter D.G. Veterinary Practice Surveillance of Cattle in Alberta, Canada. The 11th International Symposium of Veterinary Epidemiology and Economics, Australia. 2006: 760. Checkley S., Berezowski J., Renter D.G., et. al. The Alberta Veterinary Surveillance Network. The 11th International Symposium of Veterinary Epidemiology and Economics, Australia. 2006: 94. Sanderson MW, Renter D.G., Sargeant JM. Simulation of Direct Plating and Pooled Fecal Samples for Determination of E. coli O157 Herd Status. The 11th International Symposium of Veterinary Epidemiology and Economics, Australia. 2006: 810. Fox J.T., Renter D.G., Sanderson M.W., Nagaraja T.G. Development of a Cost-Effective Method to Assess the Level of E. coli O157 in Cattle Feces. Proceedings of the Annual General Meeting of the American Society of Animal Science, 2006: 268. Alam M.J., Renter D.G., Ives S.E., Nagaraja T.G. Salmonella in Clinically Ill Cattle in a Commercial Feedyard (Poster). Proceedings of the Annual General Meeting of the American Society of Microbiology, Florida. 2006: Z04. Renter D.G., Berezowski J., Clarke R. Alberta Veterinary Surveillance Network. Proceedings of the Can-West Veterinary Conference. 2004. Clarke R.R., Renter D.G., Berezowski J.A. An Electronic Network of Veterinary Practitioners for Surveillance of Alberta’s Cattle Population. Proceedings of the 37th Annual Convention of the American Association of Bovine Practitioners. 2004: 162. Renter D.G., Invited Speaker - Pre-harvest detection of E. coli O157:H7 and other enterohemorrhagic E. coli. Proceedings of the 54th Annual Meeting of the Canadian Society of Microbiologists. 2004. Berezowski J., Renter D.G., R. Evans. A Bootstrapping method for diagnostic test evaluation and prevalence estimation. Proceedings of the Society for Veterinary Epidemiology and Preventive Medicine. 2004. Renter D.G., Berezowski J., Checkley S., Campbell J., et al. Pre-slaughter monitoring of E. coli O157 and other STEC in commercial feedlots. Proceedings of the 23rd World Buiatrics Congress. 2004. Berezowski J., Renter D.G., Clarke R., et al. Electronic veterinary practice surveillance network for Alberta’s cattle population. Proceedings of the 23rd World Buiatrics Congress. 2004. Renter D.G., Invited Speaker - BSE in Canada: surveillance programs and economic ramifications. Proceedings of the American College of Veterinary Internal Medicine Annual Forum, 2004. Renter D.G., Sargeant J.M., Samadpour M., Oberst R.D., Hungerford L. L. Frequency and distribution of E. coli O157:H7 subtypes. Proceedings of the International Symposium for Veterinary Epidemiology and Economics, Chile. 2003. Renter D.G., Smith D.R., McFall M., et al. Rapid pen-level surveillance of E. coli O157:H7 in finished feedlot cattle. Proceedings of the International Symposium for Veterinary Epidemiology and Economics, Chile. 2003. Checkley S.L., Campbell J.R., Renter D.G., et al. Antimicrobial use and antimicrobial resistance in Alberta feedlots. Proceedings of the International Symposium for Veterinary Epidemiology and Economics, Chile. 2003.
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