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United States Department of Agriculture

Agricultural Research Service

Related Topics

John W Schmidt
Meat Safety & Quality Research
Research Microbiologist

Phone: (402) 762-4226
P.O. BOX 166
CLAY CENTER, NE, 68933-0166

Projects
PATHOGEN MITIGATION IN LIVESTOCK AND RED MEAT PRODUCTION
Appropriated (D)
  Accession Number: 420868
EXPLORING GENOMIC DIFFERENCES AND ECOLOGICAL RESERVOIRS TO CONTROL FOODBORNE PATHOGENS
Appropriated (D)
  Accession Number: 420888
Prevalence and Enumeration of Antimicrobial Resistant Escherichia coli and Salmonella Throughout the Beef Production Continuum
Trust (T)
  Accession Number: 425582

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Antibiotic resistant Escherichia coli and Salmonella enterica in the beef production and processing chain - (Abstract Only)
Schmidt, J.W., Harhay, D.M., Shackelford, S.D., Wheeler, T.L., Arthur, T.M. 2014. Antibiotic resistant Escherichia coli and Salmonella enterica in the beef production and processing chain. [abstract] American Society for Microbiology 114th General Meeting. No. 1033.
Examination of predictors of Salmonella enterica contamination in cattle feedlot environments - (Abstract Only)
Harhay, D.M., Arthur, T.M., Schmidt, J.W., Wang, R., Kalchayanand, N., Bosilevac, J.M., Edrington, T.S., Loneragan, G., Wheeler, T.L. 2014. Examination of predictors of Salmonella enterica contamination in cattle feedlot environments. [Abstract] Beef Industray Safety Summit. Available: www.bifsco.org/attendees.aspx.
Antibiotic resistance by source: human-cattle-swine - (Abstract Only)
Arthur, T.M., Agga, G.E., Schmidt, J.W. 2014. Antibiotic resistance by source: human-cattle-swine. [Abstract] Beef Industry Safety Summit. Available: www.bifsco.org/attendees.aspx.
Prevalence and serotypes of intimin (eae) positive Shiga toxin-producing E. coli colonizing cattle arriving at fed beef and cull cow plants in the US - (Abstract Only)
Bosilevac, J.M., Luedtke, B.E., Arthur, T.M., Kalchayanand, N., Schmidt, J.W., Shackelford, S.D., Wheeler, T.L. 2014. Prevalence and serotypes of intimin (eae) positive Shiga toxin-producing E. coli colonizing cattle arriving at fed beef and cull cow plants in the U.S. [abstract] Beef Industry Safety Summit. Available: www.bifsco.org/attendees.aspx.
Immersion in antimicrobial solutions reduces Salmonella enterica and Shiga toxin-producing Escherichia coli on beef cheek meat Reprint Icon - (Peer Reviewed Journal)
Schmidt, J.W., Bosilevac, J.M., Kalchayanand, N., Wang, R., Wheeler, T.L., Koohmaraie, M. 2014. Immersion in antimicrobial solutions reduces Salmonella enterica and Shiga toxin-producing Escherichia coli on beef cheek meat. Journal of Food Protection. 77(4):538-548.
Bacterial antibiotic resistance, animal agriculture, and human health: no simple answer at the interface of three complex systems - (Proceedings)
Schmidt, J.W. 2013. Bacterial antibiotic resistance, animal agriculture, and human health: no simple answer at the interface of three complex systems. Proceedings of the American Meat Science Association Reciprocal 66th Annual Meat Conference, June 16-19, 2013, Auburn, Alabama, p.60-63.
Characterization of Escherichia coli 0157:H7 strains isolated from supershedding cattle Reprint Icon - (Peer Reviewed Journal)
Arthur, T.M., Ahmed, R., Chase-Topping, M., Kalchayanand, N., Schmidt, J.W., Bono, J.L. 2013. Characterization of Escherichia coli 0157:H7 strains isolated from supershedding cattle. Applied and Environmental Microbiology. 79(14):4294-4303.
Mixed biofilm formation by Shiga toxin-producing Escherichia coli and Salmonella enterica serovar typhimurium enhanced bacterial resistance to sanitization due to extracellular polymeric substances Reprint Icon - (Peer Reviewed Journal)
Wang, R., Kalchayanand, N., Schmidt, J.W., Harhay, D.M. 2013. Mixed biofilm formation by Shiga toxin-producing Escherichia coli and Salmonella enterica serovar typhimurium enhanced bacterial resistance to sanitization due to extracellular polymeric substances. Journal of Food Protection. 76(9):1513-1522.
Longitudinal concentrations of antibiotic resistant Escherichia coli in feces do not correspond to the patterns of antibiotic use at a cattle feedlot - (Abstract Only)
Schmidt, J.W. 2013. Longitudinal concentrations of antibiotic resistant Escherichia coli in feces do not correspond to the patterns of antibiotic use at a cattle feedlot. American Society for Microbiology Annual Meeting. Poster No. 15 p. 101.
Characterization of E. coli O157:H7 strains isolated from super-shedding cattle - (Abstract Only)
Arthur, T.M., Ahmed, R., Chase-Topping, M., Kalchayanand, N., Schmidt, J.W., Bono, J.L. 2013. Characterization of E. coli O157:H7 strains isolated from super-shedding cattle. American Society for Microbiology General Meeting. Poster No. 1707, p 171.
Cross-sectional study examining Salmonella enterica carriage in subiliac lymph nodes of cull and feedlot cattle at harvest Reprint Icon - (Peer Reviewed Journal)
Gragg, S.E., Loneragan, G.H., Brashears, M.M., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Wang, R., Schmidt, J.W., Brooks, J.C., Shackelford, S.D., Wheeler, T.L., Brown, T.R., Edrington, T.S., Brichta-Harhay, D.M. 2013. Cross-sectional study examining Salmonella enterica carriage in subiliac lymph nodes of cull and feedlot cattle at harvest. Foodborne Pathogens and Disease. 10:368-374.
Salmonella in lymph nodes of cull and fed cattle at harvest - (Abstract Only)
Webb, H.E., Harhay, D.M., Gragg, S.E., Brashears, M.M., Nightingale, K.K., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Schmidt, J.W., Wang, R., Lonergan, G.H. 2013. Salmonella in lymph nodes of cull and fed cattle at harvest. IN: Proceedings of The Beef Industry Summit 2013, March 13-15, 2013, Dallas Texas, 2013 FLASHDRIVE.
Influence of therapeutic ceftiofur treatments of feedlot cattle on fecal and hide prevalences of commensal Escherichia coli resistant to expanded-spectrum cephalosporins, and molecular characterization of resistant isolates Reprint Icon - (Peer Reviewed Journal)
Schmidt, J.W., Griffin, D., Kuehn, L.A., Harhay, D.M. 2013. Influence of therapeutic ceftiofur treatments of feedlot cattle on fecal and hide prevalences of commensal Escherichia coli resistant to expanded-spectrum cephalosporins, and molecular characterization of resistant isolates. Applied and Environmental Microbiology. 79(7):2273-2283.
Cross-sectional study examining Salmonella enterica carriage in subiliac lymph nodes of cull and feedlot cattle at harvest Reprint Icon - (Peer Reviewed Journal)
Gragg, S.E., Loneragan, G.H., Brashears, M.M., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Wang, R., Schmidt, J.W., Brooks, J., Shackelford, S.D., Wheeler, T.L., Brown, T.R., Edrington, T.S., Harhay, D.M. 2013. Cross-sectional study examining Salmonella enterica carriage in subiliac lymph nodes of cull and feedlot cattle at harvest. Foodborne Pathogens and Disease. 10(4):368-374.
The physiologic state of Escherichia coli O157:H7 does not affect its detection in two commercial real-time PCR-based tests Reprint Icon - (Peer Reviewed Journal)
Wang, R., Schmidt, J.W., Arthur, T.M., Bosilevac, J.M. 2013. The physiologic state of Escherichia coli O157:H7 does not affect its detection in two commercial real-time PCR-based tests. Food Microbiology. 33: 205-212.
Detection of Escherichia coli O157:H7 and Salmonella enterica in air and droplets at three United States commercial beef processing plants Reprint Icon - (Peer Reviewed Journal)
Schmidt, J.W., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Wheeler, T.L. 2012. Detection of Escherichia coli O157:H7 and Salmonella enterica in air and droplets at three United States commercial beef processing plants. Journal of Food Protection. 75(12):2213-2218.
Dual-serotype biofilm formation by Shiga toxin-producing Escherichia coli 0157:H7 and 026:H11 strains - (Peer Reviewed Journal)
SWang, R., Kalchayanand, N., Schmidt, J.W., Bosilevac, J.M., Bono, J.L. 2012. Dual-serotype biofilm formation by Shiga toxin-producing Escherichia coli 0157:H7 and 026:H11 strains. Applied and Environmental Microbiology. 78(17):6341-6344.
Prevalence of lactose fermenting coliforms resistant to third generation cephalosporins in cattle feedlot throughout a production cycle and molecular characterization of resistant isolates - (Abstract Only)
Schmidt, J.W., Kuehn, L.A., Griffin, D., Harhay, D.M. 2012. Prevalence of lactose fermenting coliforms resistant to third generation cephalosporins in cattle feedlot throughout a production cycle and molecular characterization of resistant isolates [abstract]. International Association for Food Protection. p. 148-149. Abstract No. P2-95.
Evaluation of commonly used antimicrobial interventions for fresh beef inoculated with Shiga toxin-producing Escherichia coli serotypes O26, O45, O103, O111, O121, O145, and O157:H7 - (Peer Reviewed Journal)
Kalchayanand, N., Arthur, T.M., Bosilevac, J.M., Schmidt, J.W., Wang, R., Shackelford, S.D., Wheeler, T.L. 2012. Evaluation of commonly used antimicrobial interventions for fresh beef inoculated with Shiga toxin-producing Escherichia coli serotypes O26, O45, O103, O111, O121, O145, and O157:H7. Journal of Food Protection. 75(7):1207-1212.
Prevalence, enumeration, serotypes, and antimicrobial resistance phenotypes of Salmonella enterica isolates from carcasses at two large United States pork processing plants - (Peer Reviewed Journal)
Schmidt, J.W., Harhay, D.M., Kalchayanand, N., Bosilevac, J.M., Shackelford, S.D., Wheeler, T.L., Koohmaraie, M. 2012. Prevalence, enumeration, serotypes, and antimicrobial resistance phenotypes of Salmonella enterica isolates from carcasses at two large United States pork processing plants. Applied and Environmental Microbiology. 78(8):2716-2726.
Efficacy of hypobromous acid as a hide-on carcass antimicrobial intervention Reprint Icon - (Peer Reviewed Journal)
Schmidt, J.W., Wang, R., Kalchayanand, N., Wheeler, T.L., Koohmaraie, M. 2012. Efficacy of hypobromous acid as a hide-on carcass antimicrobial intervention. Journal of Food Protection. 75 (5): 955-958.
Microbiological analysis of bovine lymph nodes for the detection of Salmonella enterica - (Peer Reviewed Journal)
Harhay, D.M., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Schmidt, J.W., Wang, R., Shackelford, S.D., Loneragan, G.H., Wheeler, T.L. 2012. Microbiological analysis of bovine lymph nodes for the detection of Salmonella enterica. Journal of Food Protection. 75(5):854-858.
Salmonella in lymph nodes of cattle presented for harvest - (Abstract Only)
Gragg, S.E., Loneragan, G.H., Brashears, M.M., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Wang, R., Schmidt, J.W., Brooks, J.C., Shackelford, S.D., Wheeler, T.L., Brown, T.R., Brichta-Harhay, D.M. 2011. Salmonella in lymph nodes of cattle presented for harvest [abstract]. Proceeding of the 2011 Conference of Research Workers in Animal Diseases, December 4-6, 2011, Chicago, Illinois. p. 149.
Salmonella in lymph nodes of cattle presented for harvest - (Abstract Only)
Gragg, S.E., Loneragan, G.H., Brichta-Harhay, D.M., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Wang, R., Schmidt, J.W., Brooks, J.C., Shackelford, S.D., Wheeler, T.L., Brown, T.R., Brashears, M.M. 2011. Salmonella in lymph nodes of cattle presented for harvest [abstract]. International Association for Food Protection. p. 19. Abstract No. P1-62.
The effect of sample size and matrix on the ability of rapid methods to detect E. coli O157:H7 - (Abstract Only)
Bosilevac, J.M., Schmidt, J.W., Kalchayanand, N., Wheeler, T.L., Koohmaraie, M. 2011. The effect of sample size and matrix on the ability of rapid methods to detect E. coli O157:H7 [abstract]. 2011 Beef Industry Safety Summit, Dallas, TX. March 2-4, 2011. 2011 Beef Industry Safety Summit Research Update. Abstract No. 1.
Towards an understanding of how Salmonella potentially evades beef carcass processing interventions - (Abstract Only)
Brichta-Harhay, D.M., Gragg, S.E., Smith, T.P.L., Arthur, T.M., Bosilevac, J.M., Kalchayanand, N., Schmidt, J.W., Wang, R., Shackelford, S.D., Wheeler, T.L., Brashears, M.M., Brooks, J.C., Brown, T.R., Harhay, G.P., Loneragan, G.H. 2011. Towards an understanding of how Salmonella potentially evades beef carcass processing interventions [abstract]. 2011 Beef Industry Safety Summit. Abstract No. 2.
Inoculation of beef with low concentrations of Escherichia coli O157:H7 and examination of factors that interfere with its detection by culture isolation and rapid methods - (Peer Reviewed Journal)
Bosilevac, J.M., Kalchayanand, N., Schmidt, J.W., Shackelford, S.D., Wheeler, T.L., Koohmaraie, M. 2010. Inoculation of beef with low concentrations of Escherichia coli O157:H7 and examination of factors that interfere with its detection by culture isolation and rapid methods. Journal of Food Protection. 73:2180-2188.
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Last Modified: 9/20/2014
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