Phone
608-265-4454Office Location
1675 Observatory Dr
266 Animal Science Building
Madison, WI 53706
Dr. Sara Gragg is a professor in the Department of Animal and Dairy Sciences at the University of Wisconsin-Madison, and she has served as department chair since July 2025. She earned her B.S. in food science and technology from the University of Nebraska-Lincoln in 2006, her M.S. in food science from Texas Tech University in 2008, and her Ph.D. in animal science from Texas Tech University in 2012. Her research program investigates food safety issues affecting the meat industry, with specific interests in post-harvest interventions to prevent and/or reduce pathogen presence. She is particularly interested in studying the pre-harvest transmission of foodborne pathogens in food animals, including high-risk animal tissues such as lymph nodes, as well as interventions to reduce foodborne pathogens in live animals. She has taught courses in food microbiology, food policy, contemporary issues in animal science and agriculture, and global food systems leadership.
Selected Peer Reviewed Articles
Zhang, S., R.L. Brashears, M.M. Brashears, M.X. Sanchez, and S.E. Gragg. Surveillance of Salmonella in cull boar, sow, and gilt lymph nodes and tonsils from six cull hog processing facilities in the United States. Journal of Food Protection. 88: 100642. https://doi.org/10.1016/j.jfp.2025.100642
Abrego, A., B. Wiseman, and S.E. Gragg. Summarizing the current knowledge and existing knowledge gaps for pre-harvest and post-harvest Salmonella contamination in pork. Journal of Food Protection. 88:100609. https://doi.org/10.1016/j.jfp.2025.100609
Fashenpour, E., D.A. Vargas, G.K. Betancourt-Barszcz, S.E. Blandon, M.X. Sanchez-Plata, M.M. Brashears, M.F. Miller, Q. Kang, V. Trinetta, J.L. Vipham, R.K. Phebus, and S.E. Gragg. 2024. Salmonella prevalence and quantification in market hog lymph nodes and tonsils in several regions and seasons of the United States. Journal of Food Protection. 87:100357. https://doi.org/10.1016/j.jfp.2024.100357
Hay, V. J. Vipham, N.M. Bello, D.L. Boyle, S. Gragg, and V. Trinetta. 2024. Efficacy of cleaning and sanitizing methods in reducing Salmonella on banana leaves and bamboo baskets, common surfaces found in Cambodian fresh food markets. Food Protection Trends. 44:420-428. https://doi.org/10.4315/FPT-24-020
Vargas, D.A., R. Bueno Lopez, D.E. Casas, A.M. Osorio-Doblado, K.M. Rodriguez, N. Vargas, S.E. Gragg, M.M. Brashears, M.F. Miller, and M.X. Sanchez-Plata. 2024. Modernization data analysis and visualization for food safety research outcomes. Applied Sciences. 14:5259. https://doi.org/10.3390/app14125259
Irakoze, Z., L. Nwadike, M. Bhullar, P. Byers, and S.E. Gragg. 2024. Peroxyacetic acid and chlorine reduce Escherichia coli in agricultural surface water for potential produce post-harvest uses. Food Protection Trends. 44:359-369. https://doi.org/10.4315/FPT-23-037
Maher, J.M., J.S. Drouillard, A.N. Baker, V. de Aguiar Veloso, Q. Kang, J.J. Kastner, and S.E. Gragg. 2023. Impact of the probiotic organism Megasphaera elsdenii on Escherichia coli O157:H7 prevalence in finishing cattle. Journal of Food Protection. 86:100133. https://doi.org/10.1016/j.jfp.2023.100133
Maher, J.M., J. S. Drouillard, A.N. Baker, V. de Aguiar Veloso, Q. Kang, J.J. Kastner, and S.E. Gragg. 2023. Reduction of Escherichia coli O157:H7 in finishing cattle fed corn genetically modified to produce increased concentrations of alpha amylase in the corn kernel. Foodborne Pathogens and Disease. 20:427-434. https://doi.org/10.1089/fpd.2023.0007
Pozuelo Bonilla, K., D. Vega, J. Maher, F. Najar-Villareal, Q. Kang, V. Trinetta, T.G. O’Quinn, R.K. Phebus, and S.E. Gragg. 2023. Validation of commercial antimicrobial intervention technologies to control Salmonella on skin-on market hog carcasses and chilled pork wholesale cuts. Food Control. 151:109829. https://doi.org/10.1016/j.foodcont.2023.109829
Vargas, D. A., Betancourt-Barszcz, G. K., Blandon, S. E., Applegate, S. F., Brashears, M. M., Miller, M. F., Gragg, S. E., & Sanchez-Plata, M. X. 2023. Rapid quantitative method development for beef and pork lymph nodes using BAX® System Real Time Salmonella Assay. Foods. 12: 822. https://doi:10.3390/foods12040822
Irakoze, Z., L. Nwadike, D. Stoeckel, M. Bhullar, P. Byers, and S.E. Gragg. 2022. Evaluation of peroxyacetic acid and chlorine as treatments for surface water for post-harvest uses in the produce industry. Water. 14:3890. https://doi.org/10.3390/w14233890
Miller, M., J.M. Maher, B. Wiseman, and S.E. Gragg. 2022. Salmonella is present in multiple lymph nodes of market hog carcasses at slaughter. Food Protection Trends. 42:100-106. https://doi.org/10.4315/FPT-21-027
Haley, O.C., Y. Zhao, J.M. Maher, S.E. Gragg, V. Trinetta, M. Bhullar, and L. Nwadike. 2022. Comparative assessment of the microbial quality of agricultural water on Kansas and Missouri fresh produce farms. Food Protection Trends. 42:186-193. https://doi.org/10.4315/FPT-21-033
Habib, K., J. Drouillard, V. De Aguiar Veloso, G. Huynh, V. Trinetta, and S. E. Gragg. 2022. The Use of probiotic Megasphaera elsdenii as a pre-harvest intervention to reduce Salmonella in finishing beef cattle: An in vitro model. Microorganisms. 10:1400. https://doi.org/10.3390/microorganisms10071400
Unruh D.A., B.C. Uhl, R.K. Phebus, and S.E. Gragg. 2021. Attachment of Shiga toxin-producing Escherichia coli to pre-chill and post-chill beef brisket tissue. Microorganisms. 9:2320. https://doi.org/10.3390/microorganisms9112320
Select Book Chapters
Gragg, S.E. and M.M. Brashears. 2023. Hurdle Technology, p. 205-210. In The Encyclopedia of Meat Sciences, 3rd Edition. Academic Press, Waltham, MA.
Ackleson, J., S.E. Gragg, J. Kastner E. Mulcahy, and D. Unruh*. 2019. Developing primary laws and secondary regulations for food safety: The case of FSMA and its attendant rules, In A. Santella (ed.), Master of Public Health Competencies: A Case Study Approach, Jones and Bartlett Learning, Burlington, MA (forthcoming).
Unruh, D.A., J.J. Kastner, J.R. Jenott, S.E. Gragg. 2016. Handling of Hamburgers and Cooking Practices, p. 107-122. In P. Kotzekidou (ed.), Food Hygiene and Toxicology in Ready to Eat Foods, Academic Press, Waltham, MA.
Gragg, S.E. and M.M. Brashears. 2014. Hurdle Technology, p. 345-347. In C. Devine and M. Dikeman (eds.), The Encyclopedia of Meat Sciences, 2nd Edition. Academic Press, Waltham, MA.
Undergraduate Courses
DY SCI/AGRONOMY 471 — Food Production Systems and Sustainability
- Committee for the National FFA Food Science Career Development Event
- Editorial Board Member for the Journal of Food Protection
- CALS Academic Planning Council
- Dairy Innovation Hub Steering Committee
- Animal and Dairy Sciences Committees
- Department Chair for Animal and Dairy Sciences
2018 Advanced Degree Graduate of Distinction Award (post-graduate award) – Texas Tech University Department of Animal and Food Sciences