Sara Gragg

    Associate Professor, Chair

    Administration, Instruction, Research

    Phone

    608-265-4454

    Office Location

    1675 Observatory Dr
    266 Animal Science Building
    Madison, WI 53706

    Portrait of Dr. Sara Gragg.

    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