Guy Heaton Loneragan, PhD

Professor of Food Safety and Public Health, Department of Animal and Food Sciences, College of Agriculture and Natural Resources, Texas Tech University

Lubbock, Texas 79409-2141
This email address is being protected from spambots. You need JavaScript enabled to view it.
(806) 742-2805

Education

PhDEpidemiologyColorado State Univ., CODecember, 2001
MSPopulation and Production MedicineColorado State Univ., CODecember, 1998
BVScVeterinary MedicineUniv. of Sydney, AustraliaDecember, 1994

Experience and Appointments

Faculty FellowTexas Tech University
25% Appointment reporting to the Vice President for Research.
2014-present
Professor of Food Safety and Public HealthDept. of Animal and Food Sci., Texas Tech Univ.
75% appointment and is research focused on developing meaningful and practical solutions in complex agri-food systems for important animal and human health issues such as Salmonella, antimicrobial drug resistance, STEC.
2010-present
Associate ProfessorDept. Agricultural Sciences, West Texas A&M Univ.2007-2010
Adjunct ProfessorCollege of Veterinary Medicine, Kansas State Univ.2006-present
Assistant ProfessorDept. Agricultural Sciences, West Texas A&M Univ.2002-2007

Professional Activities and Selected Honors

McDonald's Corp., global Animal Health and Welfare Team (Antimicrobial Resistance Sub-team)2013-present
National Advisory Committee on the Microbial Criteria of Food (appointed by the US Secretary for Agriculture)2013-present
National Cattlemen's Beef Association Salmonella Working Group.2005-present
North American Meat Association Salmonella Think Tank2012-present
Zoetis-sponsored Salmonella Research Cluster2012-present
National Cattlemen's Beef Association E. coli O157 Pre-Harvest Best Production Practices Working Group.2003-present
Part of the USDA delegation on behalf of the National Cattlemen's Beef Association to the general session of the World Organization for Animal Health2012
National Academies of Science Committee Member: An Evaluation of the Food Safety Requirements of the Federal Purchase Ground Beef Program2010
Director (member of Executive Board), Association for Veterinary Epidemiology and Preventive Medicine.2009-2011
Chair, American Association of Bovine Practitioners, Beef Production Committee2009-2010
North American Food Animal Welfare Commission – Inaugural Commissioner2009-present
National Cattlemen's Beef Association Beef Quality Assurance Advisory Council2009-present
JBS Food Safety and Quality Advisory Team2009-present
Board of Directors, Academy of Veterinary Consultants2008-2014
Institutional Animal Care and Use Committee, Texas Tech University2011-2012
Alternate Member, United States Department of Agriculture Secretary's Advisory Committee on Foreign Animal and Poultry Diseases2007
Member, Board of Scientific Reviewers for the American Journal of Veterinary Research.2006-2009
Writing team member: Production Methods and Animal Husbandry, A NationalCommission on Industrial Farm Animal Production Report. The Pew Commission on Industrial Farm Animal Production.2007-2008
Declarant (June 10 and July 13 filings co-author) on behalf of United State Department of Agriculture, Animal Plant Health Inspection Service versus R-CALF USA. Cause CV-05-06-BLG-RFC in the United States district court, Billings, Montana, division.2005
Member, Steering Committee, Food Safety Research and Response Network.2004-2009
Section Leader, Animal Health Epidemiology and Economics section of the Conference of Research Workers in Animal Diseases.2004-2009
National Cattlemen's Beef Association International BSE Expert Forum.2004-2005
West Nile Virus Advisory Board for the Amarillo Health Authority.2002-2004

Professional and Industry Organizations

  • Academy of Veterinary Consultants
  • American Association of Bovine Practitioners
  • Conference of Research Workers in Animal Diseases
  • International Association for Food Protection
  • International Symposium of Veterinary Epidemiology and Economics
  • National Cattlemen's Beef Association
  • Texas Cattle Feeders' Association (Affiliate Member)
  • Texas and Southwestern Cattle Raisers Association

Scholarly Activities

Refereed Publications (including those accepted or in press)58
Abstracts and Papers Published in Proceedings>100
Book Chapter Contributions5
Government Publications or Reports with Significant Input16
Invited Presentations>70

Refereed Publications

2014 Loneragan G. H., D. U. Thomson, H. M. Scott. Increased Mortality in Groups of Cattle Administered the β-Adrenergic Agonists Ractopamine Hydrochloride and Zilpaterol Hydrochloride. PLOS ONE. 2014;9(3):e91177. doi: 10.1371/journal.pone.0091177 2014 Edrington T. S., K. M. Bischoff, G. H. Loneragan, D. J. Nisbet. Evaluation of feeding distiller's grains, containing virginiamycin, on antimicrobial susceptibilities in fecal isolates of Enterococcus and E. coli and prevalence of resistance genes in cattle. J Animal Sci. 2014; 92:1144-1149. doi: 10.2527/jas.2013-6954

2013 Kanwar N., Scott H. M., Norby B., Loneragan G. H., Vinasco J., McGowan M., Cottell J. L., Chengappa M. M., Bai J., Boerlin P. Effects of ceftiofur and chlortetracycline treatment strategies on antimicrobial susceptibility and on tet(A), tet(B), and bla CMY-2 resistance genes among E. coli isolated from the feces of feedlot cattle. PLOS ONE. 2013;8(11):e80575. doi: 10.1371/journal.pone.0080575

2013 Gragg S. E., G. H. Loneragan, K. K. Nightingale, D. M. Brichta-Harhay, H. Ruiz, J. R. Elder, L. G. Garcia, M. F. Miller, A. Echeverry, R. G. Ramírez Porras, M. M. Brashears. Substantial within-Animal Diversity of Salmonella Isolates from Lymph Nodes, Feces, and Hides of Cattle at Slaughter. Appl Environ Microbiol. 2013 Aug;79(15):4744-50. doi: 10.1128/AEM.01020-13

2013 Callaway, T. R., T. S. Edrington, G. H. Loneragan, M. A. Carr, and D. J. Nisbet. Current and near-market intervention strategies for reducing Shiga Toxin-Producing Escherichia coli (STEC) shedding in cattle. Agric. Food Anal. Bacteriol. 2013

2013 Callaway, T. R., T. S. Edrington, G. H. Loneragan, M. A. Carr, D. J. Nisbet. Shiga Toxin-Producing Escherichia coli (STEC) Ecology in Cattle and Management Based Options for Reducing Fecal Shedding. Agric. Food Anal. Bacteriol. 2013;3:39-69.

2013 Edrington, T. S., G. H. Loneragan, J. Hill, K. J. Genovese, D. M. Brichta-Harhay, R. L. Farrow, N. A. Krueger, T. R. Callaway, R. C. Anderson, D. J. Nisbet. Development of challenge models to evaluate the efficacy of a vaccine to reduce carriage of salmonella in peripheral lymph nodes of cattle. J Food Prot. 2013 Jul;76(7):1259-63. doi: 10.4315/0362-028X.JFP-12-319.

2013 Edrington, T. S., G. H. Loneragan, J. Hill, K. J. Genovese, H. He, T. R. Callaway, R. C. Anderson, D. M. Brichta-Harhay, D. J. Nisbet. Development of a transdermal salmonella challenge model in calves. J Food Prot. 2013 Jul;76(7):1255-8. doi: 10.4315/0362-028X.JFP-12-317.

2013 Gragg, S. E., G. H. Loneragan, M. M. Brashears, T. M. Arthur, J. M. Bosilevac, N. Kalchayanand, R. Wang, J. W. Schmidt, J. C. Brooks, S. D. Shackelford, T.L. Wheeler, T. R. Brown, T. S. Edrington, D. M. Brichta-Harhay. Cross-sectional Study Examining Salmonella enterica Carriage in Subiliac Lymph Nodes of Cull and Feedlot Cattle at Harvest. Foodborne Pathog Dis. 2013;10(4):368-374.

2013 Doyle, M. P, G. H. Loneragan, H. M. Scott, and R. S. Singer. Antimicrobial Resistance: Challenges and Perspectives. Comprehensive Reviews in Food Science and Food Safety. 2013;12:234-248.

2013 Cottell, J., N. Kanwar, L. Castillo-Courtade, G. Chalmers, H. Morgan Scott, B. Norby, G. H. Loneragan, P. Boerlin. blaCTX-M-32 on an IncN plasmid in E. coli from U.S. beef cattle. Antimicrob Agents Ch. 2013; 57(2):1096-1097

2013 Hill, J., T.S. Edrington, G.H. Loneragan, S.E. Gragg, and D.J. Nisbet. Rapid detection of Salmonella in bovine lymph nodes using a commercial real-time PCR system. J Postdoctoral Research. 2013;1:42-46

2012 Wolf, M. J., M. F. Miller, A. R. Parks, G. H. Loneragan, A. J. Garmyn, L. D. Thompson, A. Echeverry, M. M. Brashears. Validation Comparing the Effectiveness of a Lactic Acid Dip with a Lactic Acid Spray for Reducing Escherichia coli O157:H7, Salmonella, and Non-O157 Shiga Toxigenic Escherichia coli on Beef Trim and Ground Beef. J Food Protect. 2012;75(11):1968–1973.

2012 Krueger, N. A., T. S. Edrington, R. L. Farrow, R. Hagevoort, R. C. Anderson, G. H. Loneragan, T. R. Callaway, D. J. Nisbet. Evaluation of an Experimental Sodium Chlorate Product, With and Without Nitroethane, on Salmonella in Cull Dairy Cattle. Agric Food Anal Bacteriol. 2012;2(2):82-87.

2012 Poole, T. L., T. R. Callaway, K. M. Bischoff, G. H. Loneragan, R. C. Anderson, D. J. Nisbet. Competitive effect of commensal fecal bacteria from growing swine fed chlortetracycline–supplemented feed on β–hemolytic Escherichia coli strains with multiple antimicrobial resistance plasmids. J Applied Micro. 2012;113(3):659-668.

2012 Brichta-Harhay, D. M., T. M. Arthur, J. M. Bosilevac, N. Kalchayanand, J. W. Schmidt, R. Wang, S. D. Shackelford, G. H. Loneragan, T. L. Wheeler. Microbiological Analysis of Bovine Lymph Nodes for the Detection of Salmonella enterica. J Food Prot. 2012;75(5):854-8

2012 Loneragan, G. H., D. U. Thomson, R. M. McCarthy, H. E. Webb, A. E. Daniels, T. S. Edrington, D. J. Nisbet, S. J. Trojan, S. C. Rankin, M. M. Brashears. Salmonella diversity and burden in cows on and culled from dairy farms in the Texas High Plains. Foodborne Pathog Dis. 2012;9(6):549-555.

2012 Brashears, M. M., A. J. Garmyn, J. C. Brooks, D. Harris, G. Loneragan, A. Echeverry, T. E. Jackson, J. M. Mehaffey, M. F. Miller. Microbial quality of condensation in fresh and ready-to-eat processing facilities. Meat Sci. 2012;90(1):728-732.

2011 Yanamala, S., M. F. Miller; G. H. Loneragan, S. Gragg, M. M. Brashears. Potential for Microbial Contamination of Spinach through Feedyard Air/Dust Growing in Close Proximity to Cattle Feedyard Operations. J Food Safety. 2011;32(4):525-529.

2011 McClary, D. G., G. H. Loneragan, T. R. Shryock, B. L. Carter, C. A. Guthrie, M. J. Corbin, G. D. Mechor. Relationship of in vitro minimum concentration of tilmicosin to inhibit Mannheimia haemolytica and Pasteurella multocida and in vivo tilmicosin-treatment outcome among calves displaying signs of bovine respiratory disease. J Am Vet Med Assoc. 2011;239(1):129-35

2011 Rekow C. L., M. M. Brashears, J. C. Brooks, G. H. Loneragan, S. E. Gragg, M. F. Miller. Implementation of targeted interventions to control Escherichia coli O157:H7 in a commercial abattoir. Meat Sci. 2011;87(4):361-365.

2011 Poole, T.L., D. M. Brichta-Harhay, T. R. Callaway, R. C. Beier, K. M. Bischoff, G. H. Loneragan, R. C. Anderson, D. J. Nisbet. Persistence of resistance plasmids carried by beta-hemolytic Escherichia coli when maintained in a continuous-flow fermentation system without antimicrobial selection pressure. Foodborne Pathog Dis. 2011;8(4):535-540.

2010 Echeverry, A., J. C. Brooks, M. F. Miller, J. A. Collins, G. H. Loneragan, and M. M. Brashears. Validation of lactic acid bacteria, lactic acid, and acidified sodium chlorite as decontaminating interventions to control Escherichia coli O157:H7 and Salmonella Typhimurium DT 104 in mechanically tenderized and brine enhanced (non-intact) beef at the purveyor. Journal of Food Protection. 2010;73(12): 2169-2179.

2010 Acuff, G. A., W. K. Hallman, K. B. Harris, C. W. Hedberg, G. H. Loneragan, J. Ruzante, D. W. Schaffner, J. N. Sofos, J. G. Surak, K. M. J. Swanson, M. Wiedmann. National Research Council. An Evaluation of the Food Safety Requirements of the Federal Purchase Ground Beef Program. Washington, DC: The National Academies Press.

2010 Donder, K., D. U. Thomson, G, H. Loneragan, T. Noffsinger, W. Taylor, M. D. Apley. Lung Auscultation and Rectal Temperature as a Predictor of Lung Lesions and Bovine Respiratory Disease Treatment Outcome in Feedyard Cattle. Bovine Practioner. 2010;44(2):146-153.

2010 Hughes M.K., S. Yanamala, M. San Francisco, G.H. Loneragan, M.F. Miller, M.M. Brashears. Reduction of multidrug-resistant and drug-susceptible Salmonella in ground beef and freshly harvested beef briskets after exposure to commonly used industry antimicrobial interventions. J Food Prot. 2010;73(7):1231-1237.

2009 Echeverry A., J. C. Brooks, M. F. Miller, J. A. Collins, G. H. Loneragan, M. M. Brashears. Validation of intervention strategies to control Escherichia coli O157:H7 and Salmonella Typhimurium DT 104 in mechanically tenderized and brine-enhanced beef. J Food Prot. 2009;72(8):1616-23.

2009 Thomson, D. U., G. H. Loneragan, A. B. Thornton, K. F. Lechtenberg, D. A. Emery, D. T. Burkhardt, T. G. Nagaraja. Use of a siderophore receptor and porin proteins-based vaccine to control the burden of Escherichia coli O157:H7 in feedlot cattle. Foodborne Pathog Dis. 2009;6(7):871-877.

2009 Carlson B. A., K. K. Nightingale, G. L. Mason, J. R. Ruby, W. T. Choat, G. H. Loneragan, G. C. Smith, J. N. Sofos, K. E. Belk. Escherichia coli O157:H7 strains that persist in feedlot cattle are genetically related and demonstrate an enhanced ability to adhere to intestinal epithelial cells. Appl Environ Microbiol. 2009;75(18):5927-5937.

2009 Edrington, T. S., R. L. Farrow, G. H. Loneragan, S. E. Ives, M. J. Engler, J. J. Wagner, M. J. Corbin, W. J. Platter, D. Yates, J. P. Hutcheson, R. A. Zinn, T. R. Callaway, R. C. Anderson, D. J. Nisbet. Influence of β-Agonists (Ractopamine HCl and Zilpaterol HCl) on Fecal Shedding of Escherichia coli O157:H7 in Feedlot Cattle. J Food Prot. 72(12):2587-2591.

2009 Echeverry, A., J. C. Brooks, M. F. Miller, J. A. Collins, G. H. Loneragan, M. M. Brashears. Validation of intervention strategies to control Escherichia coli O157:H7 and Salmonella Typhimurium DT 104 in mechanically tenderized and brine-enhanced beef. J Food Prot. 72(8):1616-1623.

2009 Alali, W. Q., H. M. Scott, B. Norby, W. Gebreyes, G. H. Loneragan. Quantification of the blaCMY-2 in feces from beef feedlot cattle administered three different doses of ceftiofur in a longitudinal controlled field trial. Foodborne Pathog Dis. 6(8):917-924.

2009 Thornton, A., D. U. Thomson, G. H. Loneragan, J. T. Fox, D. T. Burkhardt, D. A. Emery, and T. G. Nagaraja. Effects of a Siderophore Receptor and Porin Proteins-Based Vaccination on Fecal Shedding of Escherichia coli O157:H7 in Experimentally Inoculated Cattle. J Food Prot. 72(4):866-869

2009 Fluckey, W. M., G. H. Loneragan, R. D. Warner, A. Echeverry, M. M. Brashears. Diversity and susceptibility of Enterococcus isolated from cattle before and after harvest. J Food Prot. 72(4):766-774.

2009 Farrow, R. L., G. H. Loneragan, J. W. Pauli, T. E. Lawrence. An exploratory observational study to develop an improved method for quantifying beef carcass salable meat yield. Meat Science. 82:143-150.