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  7. »Raghavendra Amachawadi

College of Veterinary Medicine

Raghavendra Amachawadi

 raghu

Research Assistant Professor

Microbiology/Epidemiology

BVSc (Equivalent to DVM), 2003, Bangalore Veterinary College, University of Agricultural Sciences, Bangalore, India
MS (Microbiology), 2010, Kansas State University, Manhattan, Kansas
PhD (Microbiology/Epidemiology), 2014, Kansas State University, Manhattan, Kansas

Office: 785-532-4356
Fax: 785-532-4851
Email: agraghav@vet.k-state.edu

Area of Specialization

Antimicrobial resistance
Antibiotic alternatives in food animal agriculture
Liver abscesses in feedlot cattle 

Research

My research interests are in the area of antimicrobial resistance in gut commensals and foodborne pathogens of swine and cattle production systems.  Specifically, I have focused on understanding the mechanisms involved in the propagation and dissemination of antimicrobial resistance and on the role of non-antibiotic alternatives in contribution and mitigation of antimicrobial resistance in gut bacteria of cattle and swine.  This involves both phenotypic and genotypic characterization of existing as well as novel resistance determinants.  My research interests also include investigating both aerobic and or anaerobic bacterial flora of liver abscesses of feedlot cattle.  These studies involve applications of microbiology, molecular epidemiology, and field based nutrition experiments.  

Teaching

I assist in the teaching of the laboratory course, Veterinary Bacteriology and Mycology (DMP 713) for the sophomore DVM students.

Selected Publications

Referred publications

  1. Feldpausch, J. A., R. G. Amachawadi, M. D. Tokach, H. M. Scott, T. G. Nagaraja, S. S. Dritz, R. D. Goodband, J. C. Woodworth, and J. M. DeRouchey.  2016. Effects of dietary copper, zinc, and ractopamine HCl on finishing pig growth performance, carcass characteristics, and antimicrobial susceptibility of enteric bacteria. Journal of Animal Science.  94: 3278-3293.
  2. Amachawadi, R. G., and T. G. Nagaraja.  2016.  Liver abscesses in cattle: A review of incidence in Holsteins and of bacteriology and vaccine approach to control in feedlot cattle.  Journal of Animal Science. 94:1-13.
  3. DeMars, Z., S. Biswas, R. G. Amachawadi, D. G. Renter, and V. V. Volkova.  2016.  Antimicrobial susceptibility of enteric gram negative facultative anaerobe bacilli in aerobic versus anaerobic conditions.  PLoS One. 18:11(5): e0155599.
  4. Amachawadi, R. G.,Milton Thomas, T. G. Nagaraja, and Joy Scaria.  2016.  Genome sequences of Salmonella enterica subsp. enterica Serovar Lubbock isolated from liver abscesses of feedlot cattle.  Genome Announcements. 5:4(3): pii. e00319-16.   
  5. Amachawadi, R. G., and T. G. Nagaraja.  2015.  First report of anaerobic isolation of Salmonella enterica from liver abscesses of feedlot cattle.  Journal of Clinical Microbiology. 53:3100-3101.  
  6. Amachawadi, R. G., and H. Morgan Scott.  2015.  "Emergent Infectious Diseases." Ethics, Science, Technology, and Engineering: A Global Resource. Ed. J. Britt Holbrook. 2nd ed. Vol. 2. Farmington Hills, MI: Macmillan Reference USA. 57-63. Gale Virtual Reference Library.
  7. Amachawadi, R. G., H. M. Scott, J. Vinasco, M. D. Tokach, S. S. Dritz, J. L. Nelssen, and T. G. Nagaraja.  2015.  Effects of in-feed copper, chlortetracycline, and tylosin on the prevalence of transferable copper resistance gene, tcrB, among fecal enterococci of weaned piglets.  Foodborne Pathogens and Disease. 12(8):670-678.
  8. Amachawadi, R. G., H. M. Scott, C. Aperce, J. Vinasco, J. S. Drouillard, and T. G. Nagaraja. 2015.  Effects of in-feed copper and tylosin supplementations on copper and antimicrobial resistance in fecal enterococci of feedlot cattle.  Journal of Applied Microbiology. 118: 1287-1297.
  9. Agga, G. E., H. M. Scott, T. G. Nagaraja, J. Vinasco, R. G. Amachawadi, J. Bai, B. Norby, D. G. Renter, S. S. Dritz, J. L. Nelssen, and M. D. Tokach.  2015.  Effects of chlortetracycline and copper supplementation on the prevalence, distribution, and quantity of antimicrobial resistance genes in the feces of post weaned pigs.  Preventive Veterinary Medicine. 119: 179-189.
  10. Amachawadi, R. G., H. M. Scott, S. Nitikanchana, J. Vinasco, M. D. Tokach, S. S. Dritz, J. L. Nelssen, R. D. Goodband, and T. G. Nagaraja.  2015.  Nasal carriage of mecA-positive methicillin-resistant Staphylococcus aureus in pigs exhibits dose-response to zinc supplementationFoodborne Pathogens and Disease.  12(2): 1-5.
  11. Agga, G. E., H. M. Scott, R. G. Amachawadi, T. G. Nagaraja, J. Vinasco, J. Bai, B. Norby, D. G. Renter, S. S. Dritz, J. L. Nelssen, and M. D. Tokach.  2014.  Effects of chlortetracycline and copper supplementation on antimicrobial resistance of Escherichia coli isolates from nursery pigs: Phenotypic and Genotypic analysis.  Preventive Veterinary Medicine.  114(3-4):231-246.
  12. Amachawadi, R. G., H. M. Scott, C. A. Alvarado, T. R. Mainini, J. Vinasco, J. S. Drouillard, and T. G. Nagaraja. 2013. Occurrence of the transferable copper resistance gene, tcrB, among fecal enterococci of U. S. feedlot cattle fed copper supplemented diets.  Applied and Environmental Microbiology.79 (14): 4369-4375.
  13. Kumar, A., D. Anderson, R. G. Amachawadi, T. G. Nagaraja, and S. K. Narayanan. 2013. Characterization of Fusobacterium necrophorum isolated from Ilama and Alpaca. Journal of Veterinary Diagnostic Investigation. 25(4): 502-507. 
  14. Elwakeel, E. A., R. G. Amachawadi, A. M. Nour, M. E. Nasser, T. G. Nagaraja, and E. C. Titgemeyer. 2013. In vitro degradation of lysine by ruminal fluid-based fermentations and by Fusobacterium necrophorum.  Journal of Dairy Science. 96:495-505.
  15. Amachawadi, R. G., N. W. Shelton, X. Shi, J. Vinasco, S. S. Dritz, M. D. Tokach, J. L. Nelssen, H. M. Scott, and T. G. Nagaraja. 2011. Selection of tcrB mediated copper resistant fecal enterococci in pigs fed diets supplemented with copper. Applied and Environmental Microbiology. 77(16): 5597-5603.
  16. Amachawadi, R. G., N. W. Shelton, M. E. Jacob, X. Shi, S. K. Narayanan,  L. Zurek, S. S. Dritz, J. L. Nelssen, M. D. Tokach, and T. G. Nagaraja. 2010. Occurrence of tcrB, a transferable copper resistance gene, in fecal enterococci of swine. Foodborne Pathogens and Disease. 7(9): 1089-97.