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H. Morgan Scott



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Phone: (979) 847-6197

Mailstop: 4467

Department: VTPB

Photo of Scott, H. Morgan


  • PhD Epidemiology, University of Guelph 1998
  • DVM Veterinary Medicine, University of Saskatchewan 1988


  • Post-doctoral Fellowship in Public Health

Scholarly Interests

Dr. H. Morgan Scott is a graduate veterinarian holding a PhD in epidemiology and post-doctoral training in public health. In addition to private veterinary practice, he has worked in both government (food safety surveillance) and academic settings. He is currently professor of epidemiology in the Department of Veterinary Pathobiology at Texas A&M University. He was recruited here in 2014 as part of the Texas A&M University System Chancellor’s Research Initiative and the University President’s Initiative on One Health and Infectious Diseases. He relocated from Kansas State University, where he previously held the E.J. Frick Professorship in Veterinary Medicine. Much of his research emphasis has been on studying factors impacting antimicrobial resistance among commensal and pathogenic enteric bacteria in food animal production systems, with a program spanning the realm from the molecular to the sociological. In particular, he is interested in applying both epidemiological and ecological approaches to quantify the emergence, propagation, dissemination, and persistence of resistant enteric bacterial strains in integrated populations of animals, their food products, and humans. Using this knowledge, he hopes to identify opportunities to prevent and intervene against resistance among enteric pathogens in animal agriculture; preferably, by developing readily adoptable and cost-effective management practices suited to modern animal and food production systems.


Effects of seasonal climatic conditions on the diagnosis of Mycobacterium avium subspecies paratuberculosis in dairy cattle.
Strickland SJ, Scott HM, Libal MC, Roussel AJ Jr, Jordan ER
J Dairy Sci. 88(7):2432-40.
Spatial distribution of antibodies to Salmonella enterica serovar Typhimurium O antigens in bulk milk from Texas dairy herds.
Graham SL, Barling KS, Waghela S, Scott HM, Thompson JA
Prev Vet Med. 69(1-2):53-61.
Assessing repeatability and validity of a visual analogue scale questionnaire for use in assessing pain and lameness in dogs.
Hudson JT, Slater MR, Taylor L, Scott HM, Kerwin SC
Am J Vet Res. 65(12):1634-43.
Utilizing qualitative methods in survey design: examining Texas cattle producers' intent to participate in foot-and-mouth disease detection and control.
Delgado AH, Norby B, Dean WR, McIntosh WA, Scott HM
Prev Vet Med. 103(2-3):120-35.
The effect of ocular blinkers on the horses' reactions to four different visual and audible stimuli: results of a crossover trial.
Dziezyc J, Taylor L, Boggess MM, Scott HM
Vet Ophthalmol. 14(5):327-32.
Prevalence and genotypic characteristics of Clostridium difficile in a closed and integrated human and swine population.
Norman KN, Scott HM, Harvey RB, Norby B, Hume ME, Andrews K
Appl Environ Microbiol. 77(16):5755-60.
Prevalence and patterns of antimicrobial resistance in Campylobacter spp isolated from pigs reared under antimicrobial-free and conventional production methods in eight states in the Midwestern United States.
Rollo SN, Norby B, Bartlett PC, Scott HM, Wilson DL, Fajt VR, Linz JE, Bunner CE, Kaneene JB, Huber JC Jr
J Am Vet Med Assoc. 236(2):201-10.
Assessing the similarity of antimicrobial resistance phenotypes among fecal Escherichia coli isolates from two aggregated occupational cohorts of humans versus swine using cluster analysis and multivariate statistics.
Alali WQ, Scott HM, Norby B
Prev Vet Med. 94(1-2):77-83.
Varied prevalence of Clostridium difficile in an integrated swine operation.
Norman KN, Harvey RB, Scott HM, Hume ME, Andrews K, Brawley AD
Anaerobe. 15(6):256-60.
Relationship between level of antibiotic use and resistance among Escherichia coli isolates from integrated multi-site cohorts of humans and swine.
Alali WQ, Scott HM, Christian KL, Fajt VR, Harvey RB, Lawhorn DB
Prev Vet Med. 90(3-4):160-7.
Longitudinal study of antimicrobial resistance among Escherichia coli isolates from integrated multisite cohorts of humans and swine.
Alali WQ, Scott HM, Harvey RB, Norby B, Lawhorn DB, Pillai SD
Appl Environ Microbiol. 74(12):3672-81.
Association of soil concentrations of Rhodococcus equi and incidence of pneumonia attributable to Rhodococcus equi in foals on farms in central Kentucky.
Cohen ND, Carter CN, Scott HM, Chaffin MK, Smith JL, Grimm MB, Kuskie KR, Takai S, Martens RJ
Am J Vet Res. 69(3):385-95.
Seroprevalence of and agroecological risk factors for Mycobacterium avium subspecies paratuberculosis and neospora caninum infection among adult beef cattle in cow-calf herds in Alberta, Canada.
Scott HM, Sorensen O, Wu JT, Chow EY, Manninen K
Can Vet J. 48(4):397-406.
Development of a method for Bayesian nonparametric ROC analysis with application to an ELISA for Johne's disease in dairy cattle.
Fosgate GT, Scott HM, Jordan ER
Prev Vet Med. 81(1-3):178-93.
Field testing of an enhanced direct-fecal polymerase chain reaction procedure, bacterial culture of feces, and a serum enzyme-linked immunosorbent assay for detecting Mycobacterium avium subsp paratuberculosis infection in adult dairy cattle.
Scott HM, Fosgate GT, Libal MC, Sneed LW, Erol E, Angulo AB, Jordan ER
Am J Vet Res. 68(3):236-45.
Seroprevalence of Mycobacterium avium subspecies paratuberculosis, Neospora caninum, Bovine leukemia virus, and Bovine viral diarrhea virus infection among dairy cattle and herds in Alberta and agroecological risk factors associated with seropositivity.
Scott HM, Sorensen O, Wu JT, Chow EY, Manninen K, VanLeeuwen JA
Can Vet J. 47(10):981-91.
Prevalence of class 1 integrons and antimicrobial resistance gene cassettes among enteric bacteria found in multisite group-level cohorts of humans and swine.
Campbell LD, Scott HM, Bischoff KM, Anderson RC, Harvey RB
J Food Prot. 68(12):2693-7.
World Health Organization Ranking of Antimicrobials According to Their Importance in Human Medicine: A Critical Step for Developing Risk Management Strategies to Control Antimicrobial Resistance From Food Animal Production
Collignon, Peter C, Conly, John M, Andremont, Antoine, McEwen, Scott A, Aidara-Kane, Awa, Agerso, Yvonne, Collignon, Peter, Conly, John, Ninh, Tran Dang, Donado-Godoy, Pilar
Clinical Infectious Diseases. doi: 10.1093/cid/ciw475 : ciw475.
Comparative phenotypic and genotypic characterization of temporally related non-typhoidal Salmonella isolated from human clinical cases, pigs and the environment in North Carolina.
Keelara, S., Scott, H.M., Morrow, W.M., Hartley, C.S., Griffin, D.L., Gebreyes, W.A., Thakur, S.
Foodborne Pathogens and Disease. 11, 156-164.
Role of house flies in the ecology of Enterococcus faecalis from wastewater treatment facilities.
Doud, C.W., Scott, H.M., Zurek, L.
Microbial Ecology. 67, 380-391.
Comparison of antimicrobial susceptibility among Clostridium difficile isolated from an integrated human and swine population in Texas.
Norman, K.N., Scott, H.M.**, Harvey, R.B., Norby, B., Hume, M.E.
Foodborne Pathogens and Disease. doi: 10.1089/fpd.2013.1648..
Increased mortality in groups of cattle administered the β-adrenergic agonists ractopamine hydrochloride and zilpaterol hydrochloride.
Loneragan, G.H., Thomson, D.U., Scott, H.M.
Effects of chlortetracycline and copper supplementation on antimicrobial resistance of fecal Escherichia coli from weaned pigs.
Agga, G.E., Scott, H.M.**, Amachawadi, R.G., Nagaraja, T.G., Vinasco, J., Bai, J., Norby, B., Renter, D.G., Dritz, S., Nelssen, J., Tokach, M.
Preventive Veterinary Medicine.
Ordinary least squares regression of ordered categorical data: Inferential implications for practice
Beth Larrabee, H Morgan Scott, Nora M Bello
Journal of agricultural, biological, and environmental statistics.
115 Antimicrobial resistance (AMR): Issues and solutions facing the livestock industry.
Scott, HM
Journal of Animal Science. 94 Supplement 1: 56-56.
Extended-Spectrum-Cephalosporin Resistance Genes in Escherichia coli from Beef Cattle
Cormier, Ashley C, Chalmers, Gabhan, McAllister, Tim A, Cook, Shaun, Zaheer, Rahat, Scott, H Morgan, Booker, Calvin, Read, Ron, Boerlin, Patrick
Antimicrobial Agents and Chemotherapy. 60: 1162-1163.
Dissemination of the mcr-1 colistin resistance gene
Webb, Hattie E, Granier, Sophie A, Marault, Muriel, Millemann, Yves, den Bakker, Henk C, Nightingale, Kendra K, Bugarel, Marie, Ison, Sarah A, Scott, H Morgan, Loneragan, Guy H
The Lancet Infectious Diseases. 16: 144-145.
Carbapenem-Resistant Bacteria Recovered from Faeces of Dairy Cattle in the High Plains Region of the USA
Webb, Hattie E, Bugarel, Marie, den Bakker, Henk C, Nightingale, Kendra K, Granier, Sophie A, Scott, H Morgan, Loneragan, Guy H
PloS One. 11: e0147363.
Digital dermatitis: Natural lesion progression and regression in Holstein dairy cattle over 3 years
Krull, Adam C, Shearer, Jan K, Gorden, Patrick J, Scott, H Morgan, Plummer, Paul J
Journal of Dairy Science. 99: 3718-3731.
157 Effects of dietary Cu, Zn, and ractopamine-HCl on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria.
Feldpausch, JA, Amachawadi, R, Tokach, MD, Scott, HM, Dritz, SS, Nagaraja, TG, Goodband, RD, Woodworth, JC, DeRouchey, JM
Journal of Animal Science. 94 Supplement 2: 73-74.
An estimation of cattle movement parameters in the Central States of the US
Schumm, Phillip, Scoglio, Caterina, Scott, H Morgan
Computers and Electronics in Agriculture. 116: 191-200.
Scoping review to identify potential non-antimicrobial interventions to mitigate antimicrobial resistance in commensal enteric bacteria in North American cattle production systems
Murphy, CP, Fajt, VR, Scott, HM, Foster, MJ, Wickwire, P, McEWEN, SA
Epidemiology and infection. 144: 1-18.
Effects of dietary copper, zinc, and ractopamine hydrochloride on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria
Feldpausch, JA, Amachawadi, RG, Tokach, MD, Scott, HM, Nagaraja, TG, Dritz, SS, Goodband, RD, Woodworth, JC, DeRouchey, JM
Journal of Animal Science. 94: 3278-3293.
Enhancing Practitioner Knowledge about Antibiotic Resistance: Connecting Human and Animal Health
Doyle, Michael, Acheson, David, Newland, Jason, Dwelle, Terry, Flynn, William, Scott, H. Morgan, Singer, Randall, Edge, Marianne Smith, Flood, Tony
Food Protection Trends. 36: 390-394.
An estimation of cattle movement parameters in the Central States of the US
P Schumm, C Scoglio, HM Scott
Distribution of cow–calf producers’ beliefs about reporting cattle with clinical signs of foot-and-mouth disease to a veterinarian before or during a hypothetical outbreak
AH Delgado, B Norby, HM Scott, W Dean, WA McIntosh, E Bush
Preventive Veterinary Medicine.
Distribution of cow-calf producers’ beliefs regarding gathering and holding their cattle and observing animal movement restrictions during an outbreak of foot-and-mouth disease
Amy H Delgado, Bo Norby, H Morgan Scott, Wesley Dean, W Alex McIntosh, Eric Bush
Preventive Veterinary Medicine.
Nasal Carriage of mecA-Positive Methicillin-Resistant Staphylococcus aureus in Pigs Exhibits Dose–Response to Zinc Supplementation
Raghavendra G Amachawadi, Harvey M Scott, Sureemas Nitikanchana, Javier Vinasco, Mike D Tokach, Steve S Dritz, Jim L Nelssen, Robert D Goodband, Tiruvoor G Nagaraja
Foodborne Pathogens and Disease.
Reducing Antimicrobial Usage in Agriculture and Aquaculture: Beyond Regulatory Policy
Jaap A Wagenaar, HM Scott
Zoonoses and Public Health.
Antimicrobials in Animal Agriculture: Parables and Policy
HM Scott, G Midgley, GH Loneragan
Zoonoses and Public Health.
Scoping review to identify potential non-antimicrobial interventions to mitigate antimicrobial resistance in commensal enteric bacteria in North American cattle production systems
CP Murphy, VR Fajt, HM Scott, MJ Foster, P Wickwire, SA McEWEN
Epidemiology and Infection.
Effects of chlortetracycline and copper supplementation on the prevalence, distribution, and quantity of antimicrobial resistance genes in the fecal metagenome of weaned pigs
Getahun E Agga, H Morgan Scott, Javier Vinasco, TG Nagaraja, Raghavendra G Amachawadi, Jianfa Bai, Bo Norby, David G Renter, Steve S Dritz, Jim L Nelssen, Mike D Tokach
Preventive Veterinary Medicine.
Effects of in‐feed copper and tylosin supplementations on copper and antimicrobial resistance in faecal enterococci of feedlot cattle
RG Amachawadi, HM Scott, C Aperce, J Vinasco, JS Drouillard, TG Nagaraja
Journal of Applied Microbiology.
Effects of In-Feed Copper, Chlortetracycline, and Tylosin on the Prevalence of Transferable Copper Resistance Gene, tcrB, Among Fecal Enterococci of Weaned Piglets
Raghavendra G Amachawadi, H Morgan Scott, Javier Vinasco, Mike D Tokach, Steve S Dritz, Jim L Nelssen, Tiruvoor G Nagaraja
Foodborne Pathogens and Disease.
Use of generalized ordered logistic regression for the analysis of multidrug resistance data
Getahun E Agga, H Morgan Scott
Preventive Veterinary Medicine. 121: 374-379.

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