Population Medicine & Diagnostic Sciences


Cats  

Advancing the health and well-being of animals and people


Dogs  

Advancing the health and well-being of animals and people


Pig  

Advancing the health and well-being of animals and people


Cells  

Advancing the health and well-being of animals and people


Cattle  

Advancing the health and well-being of animals and people


Horses  

Advancing the health and well-being of animals and people


Yrjö T. Gröhn

grohn

James Law Professor of Epidemiology
Department of Population Medicine and Diagnostic Sciences
College of Veterinary Medicine
Cornell University
Ithaca, New York 14853
Phone:  607-253-4394
e-mail: ytg1@cornell.edu

 

 

 

 

 

 

Research Interests

My research interests have evolved from studies of basic metabolism in ruminants and genetics to veterinary epidemiology, economic modeling and food safety. The two main areas of investigations currently ongoing in my laboratory are: 1) mathematical modeling of zoonotic infectious diseases, and 2) optimizing health and management decisions. Both of these areas of research offer opportunities for training in epidemiological and mathematical modeling, genetic analysis and economic methods.

Education

  • 1973 B.V.M., College of Vet. Med., Helsinki, Finland
  • 1977 L.V.M.,(equiv DVM) College of Vet. Med., Helsinki, Finland
  • 1980 Food Hygienist, College of Vet Med, Helsinki, Finland
  • 1982 M.P.V.M., in Epidemiology, University of California, Davis
  • 1983 M.S., in Genetics, University of California, Davis
  • 1985 D.V.M. (equiv Ph.D.), in Vet. Med., College of Vet. Med., Helsinki
  • 2002 Diplomate ECVPH (European College of Vet. Public Health)


Research and Professional Experience

  • 2001-2002 Acting Chair and 2002-2012 Chair, Dept. of Population Medicine and Diagnostic Sciences, Cornell University
  • 1998 -2001 Assoc. Chair, Dept. of Population Medicine and Diagnostic Sciences, Cornell University
  • 1993 – 1994 and 1995 - 2001 Chief, Section of Epidemiology, Cornell University, Ithaca, NY
  • 1994 - 1995 Visiting Professor, F.C. Donders Chair, University of Utrecht, Utrecht, The Netherlands
  • 1988 - Present Assistant, Associate, Full, and James Law Professor of Epidemiology, CVM, Cornell University
  • 1993 - Present Docent of Epidemiology, University of Helsinki, Finland
  • 1988 - 1991 Associate Professor, Dept. of Animal Hygiene, CVM, Helsinki, Finland
  • 1986 - 1988 Post doc, Visiting Assistant Professor, Dept. of Clinical Sciences, CVM, Cornell University


Honors and Awards

  • 1981-1982 Kellogg Fellow
  • Phi Zeta, Veterinary Medicine
  • Sigma Xi, American Research Association
  • Gamma Sigma Delta, The Honor Society of Agriculture
  • 1994-1995 F.C.Donders Chair, University of Utrecht, August, 1994 - July, 1995
  • 1999 Samuel F. Scheidy Memorial Award
  • 2007 The Gareth Davies lecture
  • 2013 The Calvin Schwabe Award for Lifetime Achievement

 

Professional Society Memberships

  • American Dairy Science Association
  • American Veterinary Medical Association
  • Association of Teachers of Veterinary Public Health and Preventive Medicine
  • Finnish Veterinary Medical Association
  • New York State Veterinary Medical Society
  • Nordic Association of Veterinary Epidemiology
  • System Dynamics Society

 

Selected Publications (2010-present; a total of 230 available)
PubMed: http://www.ncbi.nlm.nih.gov/pubmed/?term=grohn+Y

Perspective

  1. Lanzas, C., Ayscue, P., Ivanek, R., Gröhn, Y.T.: Model or meal? Animal agriculture systems as models for infectious diseases of humans. Nature Reviews, Microbiology. 2010, 8: 139-148.
  2. Dubberke, E.R., Haslam, D.B., Lanzas, C., Bobo, L.D., Burnham, C.-A., D., Gröhn, Y.T., Tarr, P.I.: The ecology and pathobiology of Clostridium difficile infections: An interdisciplinary challenge. Zoonosis and Public Health, 2011, 58: 4-20.

Mathematical Modeling

  1. Lanzas, C. Warnick, L.D. James, K.L., Wiedmann, M., Gröhn, Y.T.: Transmission dynamics of a multi-drug resistant Salmonella Typhimurium outbreak in a dairy farm. Foodborne Pathogens and Disease. 2010, 7: 467-474.
  2. Lu, Z., Schukken, Y.H, Smith, R.L., Wolfgang, D.R., Van Kessel, J.S., and Gröhn, Y.T.: Stochastic simulations of a multi-group compartmental model for Johne’s disease on US dairy herds with test-based culling interventions. Journal of Theoretical Biology. 2010 21; 264(4):1190-201.
  3. Pradhan, A.K., Ivanek, R., Gröhn, Y.T., Bukowski, R., Geornaras, I., Sofos, J.N., Wiedmann, M.: Quantitative risk assessment of listeriosis-associated deaths due to Listeria monocytogenes contamination of deli meats originating from manufacture and retail. Journal of Food Protection, 2010, 73: 620-630.
  4. Lanzas, C., Lu, Z., Gröhn, Y.T.: Mathematical modeling of the transmission and control of foodborne pathogens and antimicrobial resistance at pre-harvest. Foodborne Pathogens and Disease, 2011, 8: 1-10.
  5. Latorre, A.A., Pradhan, A.K., Van Kessel, J.A., Karns, J.S., Boor, K.J., Rice, D.H., Mangione, K.J., Gröhn, Y.T., Schukken, Y.H.: Quantitative risk assessment of listeriosis due to consumption of raw milk. Journal of Food Protection, 2011, 74: 1268-1281.
  6. Lanzas, C., Dubberke, E.R., Lu, Z., Reske, K.A., Gröhn, Y.T.: Epidemiological model for Clostridium difficile transmission in healthcare settings. Infection Control and Hospital Epidemiology, 2011, 32: 553-561.
  7. Teose, M., Ahmadizadeh, K., O’Mahony, E., Smith, R.L., Ju. Z., Ellner, S.P., Gomes, C., Gröhn, Y.T.: Embedding system dynamics in agent based models for complex adaptive systems. Int. Joint Conf. Artificial Intelligence. AAAI Press Proceedings, 7, 19-22, 2011.
  8. Pradhan, A., Ivanek, R., Gröhn, Y.T., Bukowski, R., Wiedmann, M.: Comparison of public health impact of Listeria monocytogenes product-to-product and environmental-to-product contamination of deli meats at retail. Journal of Food Protection, 2011, 74: 1860-1868.
  9. Volkova, V., Lanzas, C., Lu, Z., Gröhn Y.T.: Mathematical model of plasmid-mediated resistance to ceftiofur in commensal enteric Escherichia coli of cattle. PLoS ONE 2012, 7(5): e36738. doi:10.1371/journal.pone.0036738
  10. Reksen, O., Gröhn Y.T., Barlow, J.W., and Schukken, Y.H.: Transmission dynamics of intramammary infections with coagulase-negative staphylococci. J. Dairy Sci., 2012, 95: 4899-4910.
  11. Lu, Z., Schukken, Y.H., Smith, R.L., R. M. Mitchell, Gröhn, Y.T.: Impact of imperfect Mycobacterium avium subsp. paratuberculosis vaccines in dairy herds: A mathematical modeling approach. Prev Vet Med. 2012, 148-158.
  12. Lu, Z., Schukken YH, Smith RL, and Gröhn YT: Using vaccination to prevent the invasion of Mycobacterium avium subsp. paratuberculosis (MAP) in dairy herds: A stochastic simulation study. Prev Vet Med. (2013). http://dx.doi.org/10.1016/j.prevetmed.2013.01.006
  13. Volkova, V., Lu, Z., Lanzas, C., Gröhn Y.T.: Evaluating targets for control of plasmid-mediated antimicrobial resistance in enteric commensals of beef cattle: a modelling approach. Epidemiol. Infect., 2013 Jan 23:1-19.
  14. Smith, R.L, Schukken, Y.H, Lu, Z., Mitchell, R.M., Gröhn, Y.T.: Development of a model to simulate infection dynamics of Mycobacterium bovis in cattle herds in the United States. JAVMA. 2013 Aug 1;243(3):411-23. doi: 10.2460/javma.243.3.411.
  15. Smith, R.L., Tauer, L.W., Schukken, Y.H, Lu, Z., Mitchell, R.M., Gröhn, Y.T.: Minimizing of bovine tuberculosis control costs in US dairy herds. Prev Vet Med. 2013 Aug 14. doi:pii: S0167-5877(13)00240-7.10.1016/j.prevetmed.2013.07.014.
  16. Volkova, V., Lu, Z., Lanzas, C., Scott, H.M., Gröhn Y.T.: Modeling dynamics of plasmid-gene mediated antimicrobial resistance in enteric bacteria using stochastic differential equations. Nature Scientific Reports. In press.

Optimizing Health and Management

  1. Hertl, J.A., Gröhn, Y. T., Leach, J.D.G., Bar, D., Bennett, G.J., Gonzalez, R.N., Rauch, B.J., Welcome F.L., Tauer., L.W., and Schukken, Y.H: Effects of clinical mastitis due to Gram-positive and Gram-negative bacteria, and other organisms, on the probability of conception in New York State Holstein dairy cows. J. Dairy Sci. 2010, 93: 1551-1560.
  2. Smith, R.L., Strawderman, R.L., Wells, S.J., Pradhan, A., Whitlock, R.H., Van Kessel, J.S., Schukken, Y.H., Gröhn, Y.T.: Effect of Johne’s disease status on reproduction and culling in dairy cattle. J. Dairy Sci., 2010, 93: 3513-3524.
  3. Cha, E., Hertl, J.A., Bar, D., and Gröhn, Y.T.: The cost of different types of lameness in dairy cows calculated by dynamic programming. Prev Ved Med, 2010, 97: 1-8.
  4. Schukken, Y.H., Bar, D., Hertl, J., Gröhn, Y.T.: Correlated time to event data: Modeling repeated clinical mastitis data from dairy cattle in New York State. Preventive Veterinary Medicine, 2010, 97: 150-156.
  5. Dressler, J.B., Smith, R.L., Tauer, L.W., Schukken, Y.H., Gröhn, Y.T.: Economic analysis of the cross-reactivity of Johne’s disease vaccination with tuberculosis in dairy cattle. The American Journal of Agricultural Economics, 2010, 92: 1446-1455.
  6. Andersen, F., Østerås, O., Reksen, O., Gröhn, Y.T.: Mastitis and the shape of the lactation curve in Norwegian dairy cows. Journal of Dairy Research. 2011, 78: 23-31.
  7. Wang, C., Turnbull, B.W., Nielsen, S.S., Gröhn, Y.T.: Bayesian analysis of longitudinal Johne’s disease diagnostic data without a gold standard test. Journal of Dairy Science, 2011, 94: 2320-2328.
  8. Cha, E., Bar, D., Hertl, J.A., Tauer, L.W., Bennett, G., González, R.N., Schukken, Y.H., Welcome, F.L., Gröhn, Y.T.: The cost and management of different types of clinical mastitis in dairy cows estimated by dynamic programming. Journal of Dairy Science, 2011, 94: 4476-4487.
  9. Hertl, J.A., Schukken, Y.H, Bar, D., Bennett, G.J., Gonzalez, R.N., Rauch, B.J., Welcome, F.L., Tauer, L.W., Gröhn, Y.T.: The effect of recurrent episodes of clinical mastitis caused by gram-positive and gram-negative bacteria and other organisms on mortality and culling in Holstein dairy cows. Journal of Dairy Science, 2011, 94: 4863-4877.
  10. Smith, R.L., Schukken, Y.H., Pradhan, A.K., Smith, J.M., Whitlock, R.H., Van Kessel, J.S., Wolfgang, D.R., Gröhn, Y.T.: Environmental contamination with Mycobacterium avium subsp. paratuberculosis in endemically infected dairy herds. Preventive Veterinary Medicine 2011 Oct 1; 102(1): 1-9.
  11. Cho, J., Tauer, L.W., Schukken, Y.H., Gomez, M.I., Smith, R.L., Zhao, L. and Gröhn, Y.T.: Economic analysis of Mycobacterium avium subsp. paratuberculosis vaccines in dairy herds. Journal of Dairy Science, 2012, 95: 1855-1872.
  12. Cho, J., Tauer, L.W., Schukken, Y.H., Smith, R.L., Zhao, L. and Gröhn, Y.T.: Cost-effective control strategies for Johne’s Disease in dairy herds. The Canadian J. of Ag. Econ. 00 (2012) 1–26 DOI: 10.1111/j.1744-7976.2012.01270.x.
  13. Strawn, L.K., Fortes, E.D., Bihn, E.A., Nightingale, K.K., Gröhn, Y.T., Worobo, R.W., Wiedmann, M., Bergholz P.W.: Landscape and meteorological factors affecting prevalence of three food-borne pathogens in fruit and vegetable farms. Applied and environmental microbiology 2013, 79:588-600.
  14. Malley, T.J.V., Stasiewicz, M.J., Gröhn, Y.T., Roof, S., Warchocki, S., Nightingale, K., and Wiedmann, M.: Implementation of statistical tools to support identification and management of persistent Listeria monocytogenes contamination in smoked fish processing plants. Journal of Food Protection 2013, 76(5):796-811. DOI:10.4315/0362-028X.JFP-12-236 pp.796-811.
  15. Cha, E., Hertl, J.A., Schukken, Y.H., Welcome, F.L., Gröhn, Y.T.: The effect of repeated episodes of bacteria specific clinical mastitis on mortality and culling in Holstein dairy cows. Journal of Dairy Science. J Dairy Sci. 2013 Aug;96(8):4993-5007.