R Nayak

Summary

Affiliation: Food and Drug Administration
Country: USA

Publications

  1. ncbi request reprint Genetic diversity and virulence gene determinants of antibiotic-resistant Salmonella isolated from preharvest turkey production sources
    R Nayak
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
    Int J Food Microbiol 91:51-62. 2004
  2. ncbi request reprint PCR identification of Campylobacter coli and Campylobacter jejuni by partial sequencing of virulence genes
    Rajesh Nayak
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
    Mol Cell Probes 19:187-93. 2005
  3. 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
  4. 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
  5. doi request reprint Microarray analysis of antimicrobial resistance genes in Salmonella enterica from preharvest poultry environment
    W Zou
    Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR, USA
    J Appl Microbiol 107:906-14. 2009
  6. ncbi request reprint Isolation and characterisation of Salmonella in a turkey production facility
    R Nayak
    US FDA, National Center for Toxicological Research, Jefferson, Arkansas
    Br Poult Sci 44:192-202. 2003
  7. ncbi request reprint Screening of Salmonella isolates from a turkey production facility for antibiotic resistance
    R Nayak
    US Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, Arkansas 72079, USA
    Poult Sci 81:1496-500. 2002
  8. 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
  9. ncbi request reprint Molecular characterization of fluoroquinolone-resistant Campylobacter spp. isolated from poultry
    M S Nawaz
    Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas 72079, USA
    Poult Sci 82:251-8. 2003
  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

Collaborators

Detail Information

Publications15

  1. ncbi request reprint Genetic diversity and virulence gene determinants of antibiotic-resistant Salmonella isolated from preharvest turkey production sources
    R Nayak
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR 72079, USA
    Int J Food Microbiol 91:51-62. 2004
    ..A combination of genotypic and phenotypic markers can be useful in studying genetic variation among natural salmonellae populations in turkey production and delineating possible transmission pathways...
  2. ncbi request reprint PCR identification of Campylobacter coli and Campylobacter jejuni by partial sequencing of virulence genes
    Rajesh Nayak
    Division of Microbiology, National Center for Toxicological Research, US Food and Drug Administration, 3900 NCTR Road, Jefferson, AR 72079, USA
    Mol Cell Probes 19:187-93. 2005
    ..jejuni, and 41% of turkey and 53% of chicken isolates as C. coli. All human isolates were identified as C. jejuni. The specificity of this assay to detect C. coli or C. jejuni was 97%...
  3. 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
    ....
  4. 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...
  5. doi request reprint Microarray analysis of antimicrobial resistance genes in Salmonella enterica from preharvest poultry environment
    W Zou
    Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, AR, USA
    J Appl Microbiol 107:906-14. 2009
    ..To detect antimicrobial resistance genes in Salmonella isolates from turkey flocks using the microarray technology...
  6. ncbi request reprint Isolation and characterisation of Salmonella in a turkey production facility
    R Nayak
    US FDA, National Center for Toxicological Research, Jefferson, Arkansas
    Br Poult Sci 44:192-202. 2003
    ..Integrators and poultry producers may be able to design hazard analysis and critical control point (HACCP) protocols to reduce the incidence of Salmonella arriving at the processing plant...
  7. ncbi request reprint Screening of Salmonella isolates from a turkey production facility for antibiotic resistance
    R Nayak
    US Food and Drug Administration, National Center for Toxicological Research, Division of Microbiology, Jefferson, Arkansas 72079, USA
    Poult Sci 81:1496-500. 2002
    ..Identifying preharvest sources and characterizing serotype and antibiotic-resistance profile can assist poultry producers and integrators in tracking movement of Salmonella on turkey farms...
  8. 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...
  9. ncbi request reprint Molecular characterization of fluoroquinolone-resistant Campylobacter spp. isolated from poultry
    M S Nawaz
    Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas 72079, USA
    Poult Sci 82:251-8. 2003
    ..The PFGE patterns of the 17 fluoroquinolone-resistant isolates were different from the nine sensitive campylobacter strains...
  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 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...