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Epidemiology and Surveillance

Whole-Genome Sequencing for Detecting Antimicrobial Resistance in Nontyphoidal Salmonella

Patrick F. McDermott, Gregory H. Tyson, Claudine Kabera, Yuansha Chen, Cong Li, Jason P. Folster, Sherry L. Ayers, Claudia Lam, Heather P. Tate, Shaohua Zhao
Patrick F. McDermott
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Gregory H. Tyson
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Claudine Kabera
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Yuansha Chen
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Cong Li
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Jason P. Folster
bDivision of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
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Sherry L. Ayers
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Claudia Lam
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Heather P. Tate
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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Shaohua Zhao
aDivision of Animal and Food Microbiology, Office of Research, Center for Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland, USA
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DOI: 10.1128/AAC.01030-16
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ABSTRACT

Laboratory-based in vitro antimicrobial susceptibility testing is the foundation for guiding anti-infective therapy and monitoring antimicrobial resistance trends. We used whole-genome sequencing (WGS) technology to identify known antimicrobial resistance determinants among strains of nontyphoidal Salmonella and correlated these with susceptibility phenotypes to evaluate the utility of WGS for antimicrobial resistance surveillance. Six hundred forty Salmonella of 43 different serotypes were selected from among retail meat and human clinical isolates that were tested for susceptibility to 14 antimicrobials using broth microdilution. The MIC for each drug was used to categorize isolates as susceptible or resistant based on Clinical and Laboratory Standards Institute clinical breakpoints or National Antimicrobial Resistance Monitoring System (NARMS) consensus interpretive criteria. Each isolate was subjected to whole-genome shotgun sequencing, and resistance genes were identified from assembled sequences. A total of 65 unique resistance genes, plus mutations in two structural resistance loci, were identified. There were more unique resistance genes (n = 59) in the 104 human isolates than in the 536 retail meat isolates (n = 36). Overall, resistance genotypes and phenotypes correlated in 99.0% of cases. Correlations approached 100% for most classes of antibiotics but were lower for aminoglycosides and beta-lactams. We report the first finding of extended-spectrum β-lactamases (ESBLs) (blaCTX-M1 and blaSHV2a) in retail meat isolates of Salmonella in the United States. Whole-genome sequencing is an effective tool for predicting antibiotic resistance in nontyphoidal Salmonella, although the use of more appropriate surveillance breakpoints and increased knowledge of new resistance alleles will further improve correlations.

FOOTNOTES

    • Received 13 May 2016.
    • Returned for modification 31 May 2016.
    • Accepted 27 June 2016.
    • Accepted manuscript posted online 5 July 2016.
  • Supplemental material for this article may be found at http://dx.doi.org/10.1128/AAC.01030-16.

  • Copyright © 2016, American Society for Microbiology. All Rights Reserved.
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Whole-Genome Sequencing for Detecting Antimicrobial Resistance in Nontyphoidal Salmonella
Patrick F. McDermott, Gregory H. Tyson, Claudine Kabera, Yuansha Chen, Cong Li, Jason P. Folster, Sherry L. Ayers, Claudia Lam, Heather P. Tate, Shaohua Zhao
Antimicrobial Agents and Chemotherapy Aug 2016, 60 (9) 5515-5520; DOI: 10.1128/AAC.01030-16

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Whole-Genome Sequencing for Detecting Antimicrobial Resistance in Nontyphoidal Salmonella
Patrick F. McDermott, Gregory H. Tyson, Claudine Kabera, Yuansha Chen, Cong Li, Jason P. Folster, Sherry L. Ayers, Claudia Lam, Heather P. Tate, Shaohua Zhao
Antimicrobial Agents and Chemotherapy Aug 2016, 60 (9) 5515-5520; DOI: 10.1128/AAC.01030-16
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