Rajesh Nayak

Summary

Affiliation: Food and Drug Administration
Country: USA

Publications

  1. pmc An FDA bioinformatics tool for microbial genomics research on molecular characterization of bacterial foodborne pathogens using microarrays
    Hong Fang
    Z Tech Corporation, ICF International Company at National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR, USA
    BMC Bioinformatics 11:S4. 2010
  2. doi request reprint Molecular epidemiological analysis and microbial source tracking of Salmonella enterica serovars in a preharvest turkey production environment
    Rajesh Nayak
    U S Department of Health and Human Services, Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, Arkansas 72079, USA
    Foodborne Pathog Dis 5:115-26. 2008
  3. doi request reprint Chromosomal and plasmid-mediated fluoroquinolone resistance mechanisms among broad-spectrum-cephalosporin-resistant Escherichia coli isolates recovered from companion animals in the USA
    Bashar W Shaheen
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
    J Antimicrob Chemother 68:1019-24. 2013
  4. pmc DNA sequence analysis of plasmids from multidrug resistant Salmonella enterica serotype Heidelberg isolates
    Jing Han
    Division of Microbiology, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, AK, USA
    PLoS ONE 7:e51160. 2012
  5. ncbi request reprint Microarray analysis of virulence gene profiles in Salmonella serovars from food/food animal environment
    Wen Zou
    Division of Personalized Nutrition and Medicine, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079, United States
    J Infect Dev Ctries 5:94-105. 2011
  6. pmc Comparison of Salmonella enterica serovar Heidelberg isolates from human patients with those from animal and food sources
    Jing Han
    Division of Microbiology, FDA National Center for Toxicological Research, Jefferson, Arizona 72079, USA
    J Clin Microbiol 49:1130-3. 2011
  7. pmc Meta-analysis of pulsed-field gel electrophoresis fingerprints based on a constructed Salmonella database
    Wen Zou
    Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, Arkansas, United States of America
    PLoS ONE 8:e59224. 2013
  8. pmc Molecular characterization of resistance to extended-spectrum cephalosporins in clinical Escherichia coli isolates from companion animals in the United States
    Bashar W Shaheen
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, Arkansas 72079, USA
    Antimicrob Agents Chemother 55:5666-75. 2011
  9. ncbi request reprint In vitro antimicrobial susceptibility, genetic diversity and prevalence of UDP-glucose 4-epimerase (galE) gene in Campylobacter coli and Campylobacter jejuni from Turkey production facilities
    Rajesh Nayak
    US Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, AR 72079, USA
    Food Microbiol 23:379-92. 2006
  10. pmc Evaluation of pulsed-field gel electrophoresis profiles for identification of Salmonella serotypes
    Wen Zou
    Division of Personalized Nutrition and Medicine HFT 20, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, AR 72079, USA
    J Clin Microbiol 48:3122-6. 2010

Detail Information

Publications18

  1. pmc An FDA bioinformatics tool for microbial genomics research on molecular characterization of bacterial foodborne pathogens using microarrays
    Hong Fang
    Z Tech Corporation, ICF International Company at National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR, USA
    BMC Bioinformatics 11:S4. 2010
    ..ArrayTrack™ has been widely adopted by the research community and used for pharmacogenomics data review in the FDA's Voluntary Genomics Data Submission program...
  2. doi request reprint Molecular epidemiological analysis and microbial source tracking of Salmonella enterica serovars in a preharvest turkey production environment
    Rajesh Nayak
    U S Department of Health and Human Services, Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, Arkansas 72079, USA
    Foodborne Pathog Dis 5:115-26. 2008
    ....
  3. doi request reprint Chromosomal and plasmid-mediated fluoroquinolone resistance mechanisms among broad-spectrum-cephalosporin-resistant Escherichia coli isolates recovered from companion animals in the USA
    Bashar W Shaheen
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
    J Antimicrob Chemother 68:1019-24. 2013
    ..This study was undertaken because previous epidemiological studies identified a potential correlation between extended-spectrum cephalosporins and fluoroquinolone resistance...
  4. pmc DNA sequence analysis of plasmids from multidrug resistant Salmonella enterica serotype Heidelberg isolates
    Jing Han
    Division of Microbiology, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, AK, USA
    PLoS ONE 7:e51160. 2012
    ..Prevalence of such plasmids can complicate efforts to control the spread of S. enterica serovar Heidelberg in food animal and human populations...
  5. ncbi request reprint Microarray analysis of virulence gene profiles in Salmonella serovars from food/food animal environment
    Wen Zou
    Division of Personalized Nutrition and Medicine, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR 72079, United States
    J Infect Dev Ctries 5:94-105. 2011
    ....
  6. pmc Comparison of Salmonella enterica serovar Heidelberg isolates from human patients with those from animal and food sources
    Jing Han
    Division of Microbiology, FDA National Center for Toxicological Research, Jefferson, Arizona 72079, USA
    J Clin Microbiol 49:1130-3. 2011
    ..Most (88%) contained plasmids, and 47% were resistant to antimicrobials. The overall results were compared to those of previous S. Heidelberg studies of food- and animal-related sources, and multiple similarities were observed...
  7. pmc Meta-analysis of pulsed-field gel electrophoresis fingerprints based on a constructed Salmonella database
    Wen Zou
    Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, Arkansas, United States of America
    PLoS ONE 8:e59224. 2013
    ..The presence of distinct, serotype specific patterns may provide useful information to aid in the distribution of serotypes in the population and potentially reduce the need for laborious analyses, such as traditional serotyping...
  8. pmc Molecular characterization of resistance to extended-spectrum cephalosporins in clinical Escherichia coli isolates from companion animals in the United States
    Bashar W Shaheen
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, Arkansas 72079, USA
    Antimicrob Agents Chemother 55:5666-75. 2011
    ..This study shows the emergence of conjugative plasmid-borne ESBLs among E. coli strains from companion animals in the United States, which may compromise the effective therapeutic use of ESCs in veterinary medicine...
  9. ncbi request reprint In vitro antimicrobial susceptibility, genetic diversity and prevalence of UDP-glucose 4-epimerase (galE) gene in Campylobacter coli and Campylobacter jejuni from Turkey production facilities
    Rajesh Nayak
    US Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, AR 72079, USA
    Food Microbiol 23:379-92. 2006
    ..coli (0.910) and C. jejuni (0.968), suggesting that a combination of typing methods is more useful in examining the diverse Campylobacter population on turkey farms...
  10. pmc Evaluation of pulsed-field gel electrophoresis profiles for identification of Salmonella serotypes
    Wen Zou
    Division of Personalized Nutrition and Medicine HFT 20, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, AR 72079, USA
    J Clin Microbiol 48:3122-6. 2010
    ..Discriminatory DNA band class markers were identified for distinguishing Salmonella serotype Heidelberg, Javiana, Typhimurium, and Newport isolates...
  11. pmc Population dynamics of Salmonella enterica serotypes in commercial egg and poultry production
    Steven L Foley
    Division of Microbiology, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, Arkansas 72079, USA
    Appl Environ Microbiol 77:4273-9. 2011
    ..In this review, we have highlighted bacterial genetic and host-related factors that may contribute to such shifts in Salmonella populations in commercial poultry and intervention strategies that could limit their colonization...
  12. doi request reprint Evaluation of virulence and antimicrobial resistance in Salmonella enterica serovar Enteritidis isolates from humans and chicken- and egg-associated sources
    Jing Han
    1 Division of Microbiology, National Center for Toxicological Research, U S Food and Drug Administration, Jefferson, Arkansas
    Foodborne Pathog Dis 10:1008-15. 2013
    ....
  13. pmc Comparison of Salmonella enterica serovar Heidelberg susceptibility testing results
    Rajesh Nayak
    National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas, USA
    Clin Med Res 5:98-105. 2007
    ..The goal of this study was to determine the correlation of results from different AST methods for the Salmonella enterica serovar Heidelberg...
  14. doi request reprint Phenotypic and genotypic characterization of tetracycline and minocycline resistance in Clostridium perfringens
    Miseon Park
    National Center for Toxicological Research, FDA, Jefferson, AR 72079, USA
    Arch Microbiol 192:803-10. 2010
    ..The presence of part of tet(M) in some strains of C. perfringens containing tetB(P) may have occurred by recent gene transfer...
  15. ncbi request reprint Improved cell typing by charge-state deconvolution of matrix-assisted laser desorption/ionization mass spectra
    Jon G Wilkes
    National Center for Toxicological Research, FDA, 3900 NCTR Road, Jefferson, AR 72079, USA
    Rapid Commun Mass Spectrom 20:1595-603. 2006
    ..Deconvolution may enhance detection of early disease state or therapy progress markers in various tissues analyzed by MALDI-MS...
  16. ncbi request reprint Rapid phenotypic characterization of Salmonella enterica strains by pyrolysis metastable atom bombardment mass spectrometry with multivariate statistical and artificial neural network pattern recognition
    Jon G Wilkes
    National Center for Toxicological Research, FDA, 3900 NCTR Drive, Jefferson, AR 72079, USA
    J Microbiol Methods 61:321-34. 2005
    ..They each cross-validated by LOO at 90%. This is the first direct correlation of pyrolysis metastable atom bombardment mass spectrometry with immunological (e.g. serology) or molecular biology (e.g. PFGE) based techniques...
  17. ncbi request reprint Influence of growth media on vancomycin resistance of Enterococcus isolates and correlation with resistance gene determinants
    Rajesh Nayak
    US Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, AR 72079, USA
    FEMS Microbiol Lett 214:159-63. 2002
    ..However, for vanC2/C3 genotypes, the E-test method, irrespective of the plating medium, tested better than the broth dilution assay...
  18. pmc Characterization of Salmonella enterica serovar Heidelberg from turkey-associated sources
    Pravin Kaldhone
    Marshfield Clinic Research Foundation, 1000 North Oak Avenue, Marshfield, WI 54449, USA
    Appl Environ Microbiol 74:5038-46. 2008
    ..Conjugation experiments indicated that resistance to multiple antimicrobial agents was transferable among strains with diverse PFGE profiles...