College of Veterinary Medicine and Biomedical Sciences, Texas A&M University
Department of Veterinary Integrative Biosciences
VMA Bldg., Rm. 107, 4458 TAMU, College Station, TX 77843-4458
I have been interested in food safety epidemiology ever since my DVM training. I am fascinated with systems and I see food safety epidemiology as a farm-to-table system in which the classical epidemiological triad of pathogen, host and the surrounding environment is embedded in a complex net of interactions among consumers, government and food producers. My veterinary degree gave me a good understanding of the distribution and transmission of foodborne pathogens along the farm-to-table continuum. After a couple of years of practicing veterinary medicine and working for a state veterinary administration in Europe, I pursued graduate education and research in food safety epidemiology at Cornell University. Currently, I am holding an Assistant Professor position at Texas A&M University.
My research interests have been in the application and development of mathematical modeling, risk assessment and computational methods in the epidemiology of foodborne pathogens of public health importance, with particular emphasis on Listeria monocytogenes, Salmonella and Escherichia coli in domestic animals, environments and foods. The goal of this research is to identify effective intervention strategies to control these pathogens and protect human health by considering the whole farm-to-table food system.
Texas A&M University
Veterinarska ambulanta Mr. Husnjak , Croatia
- Hu, Y., K. Gall, A. J. Ho, R. Ivanek, Y. T. Gröhn, and M. Wiedmann. 2006. Daily variability of Listeria contamination patterns in a cold-smoked salmon processing operation. Journal of Food Protection. 69: 2123-2133.
- Ivanek, R., Y. T. Gröhn, M. Wiedmann. 2006. Listeria monocytogenes in multiple habitats and host populations: review of available data for mathematical modeling. Foodborne Pathogens and Disease. 3(4):319-336. (Review)
- Ivanek, R., Y. T. Gröhn, A. J. Ho, and M. Wiedmann. 2007. Markov chain approach to analyze the dynamics of pathogen fecal shedding -Example of Listeria monocytogenes shedding in a herd of dairy cattle. Journal of Theoretical Biology. 245: 44–58.
- Tauer, L. W., C. R. Nightingale, R. Ivanek, Y. T. Gröhn, and M. Wiedmann. 2007. Optimal levels of inputs to control Listeria monocytogenes contamination at a smoked fish plant. Agribusiness: an International Journal. 23(2): 229-244.
- McGann, P., R. Ivanek, M. Wiedmann, and K. J. Boor. 2007. Temperature-dependent expression of Listeria monocytogenes internalin and internalin-like genes suggests functional diversity for these proteins among the listeriae. Applied & Environmental Microbiology. Vol. 73(9): 2806-2814.
- Ho, A.J., R. Ivanek, Y. T. Gröhn, K. K. Nightingale, and M. Wiedmann. 2007. Listeria monocytogenes fecal shedding in dairy cattle shows high levels of day-to-day variation and includes outbreaks and sporadic cases of shedding of specific L. monocytogenes subtypes. Preventive Veterinary Medicine. 80:287-305.
- Gröhn, Y., J. Hertl, R. Ivanek, K. Abou-Zeid, and M. Wiedmann. 2007. How University Researchers Can Contribute to Farm-to-Table Risk Assessments: Listeria monocytogenes as an Example. Foodborne Pathogens and Disease. 4(4): 527-537.
- Lanzas, C., S. Brien, R. Ivanek, Y. Lo, P. P. Chapagain, K. A. Ray, P. Ayscue, L. D. Warnick, and Y. T. Gröhn . 2008. The effect of heterogeneous infectious period and contagiousness on the dynamics of Salmonella transmission. Epidemiology and Infection. 16:1-15.
- Mc Gann, P., S. Raengpradub, R. Ivanek, M. Wiedmann, and K. J. Boor. 2008. Differential regulation of Listeria monocytogenes internalin and internalin-like genes by sigma B and PrfA as revealed by subgenomic microarray analyses. Foodborne Pathogens and Disease. 5(4): 417-435.
- Ivanek, R., Y. T. Gröhn, M. T. Wells, S. Raengpradub, M. J. Kazmierczak, and M. Wiedmann. 2008. Extreme value theory in analysis of differential expression in microarrays where either only up- or down-regulated genes are relevant or expected. Genetics Research. 90: 347-361.
- Lanzas, C., L. D. Warnick, R. Ivanek, P. Ayscue, D. Nydam, and Y. T. Gröhn. 2008. The risk and control of Salmonella outbreaks in calf-raising operations: a mathematical modeling approach. Veterinary Research. 39:61.
- Pradhan, A. K., R. Ivanek, Y. T. Gröhn, I. Geornaras, J. Sofos, and M. Wiedmann. 2009. Quantitative Risk Assessment for Listeria monocytogenes in Selected Categories of Deli Meats: Impact of Lactate-Diacetate on Listeriosis Cases and Deaths. Journal of Food Protection. 72(5): 978–989.
- Ayscue P., C. Lanzas, R. Ivanek, and Y. T. Gröhn. 2009. Modeling On-Farm Escherichia coli O157:H7 Population Dynamics. Foodborne Pathogens and Disease. 6(4): 461-470.
- Alexander, K. A., L. D. Warnick, C. J. Cripps, P. L. McDonough, Y. T. Gröhn, M. Wiedmann, K. E. Reed, K. L. James, Y. Soyer, and R. Ivanek. 2009. Fecal shedding of, antimicrobial resistance in, and serologic response to Salmonella Typhimurium in dairy calves. JAVMA. 235(6): 739-748.
- Ivanek, R., Y. T. Gröhn, A. J. Lembo Jr, B. D. Sauders, and M. Wiedmann. 2009. Modeling of spatially referenced environmental and meteorological factors influencing the probability of Listeria spp. isolation from natural environments. Applied & Environmental Microbiology. 75(18): 5893-5909.
- Lanzas, C., P. Ayscue, R. Ivanek, and Y. T. Gröhn. 2010. Model or Meal? Farm animal populations as models for infectious diseases of humans. Nature Reviews Microbiology. (8): 139-148. February issue, doi:10.1038/nrmicro2268.
- Pradhan, A.K., R. Ivanek, Y. T. Gröhn, R. Bukowski, I. Geornaras, J. Sofos, and M. Wiedmann. 2010. Quantitative Risk Assessment of Listeriosis-associated Deaths due to Listeria monocytogenes Contamination of Deli Meats Originating from Manufacture and Retail. Journal of Food Protection. 73(4): 620-630.