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Epidemiology and Surveillance

Increasing Antimicrobial Resistance in Nontyphoidal Salmonella Isolates in Australia from 1979 to 2015

Deborah A. Williamson, Courtney R. Lane, Marion Easton, Mary Valcanis, Janet Strachan, Mark G. Veitch, Martyn D. Kirk, Benjamin P. Howden
Deborah A. Williamson
aMicrobiological Diagnostic Unit Public Health Laboratory, Department of Microbiology & Immunology, The University of Melbourne at The Doherty Institute for Infection and Immunity, Melbourne, Australia
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Courtney R. Lane
aMicrobiological Diagnostic Unit Public Health Laboratory, Department of Microbiology & Immunology, The University of Melbourne at The Doherty Institute for Infection and Immunity, Melbourne, Australia
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Marion Easton
bDepartment of Health and Human Services, Victoria, Australia
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Mary Valcanis
aMicrobiological Diagnostic Unit Public Health Laboratory, Department of Microbiology & Immunology, The University of Melbourne at The Doherty Institute for Infection and Immunity, Melbourne, Australia
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Janet Strachan
bDepartment of Health and Human Services, Victoria, Australia
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Mark G. Veitch
cDepartment of Health and Human Services, Tasmania, Australia
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Martyn D. Kirk
dAustralian National University, Canberra, Australia
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Benjamin P. Howden
aMicrobiological Diagnostic Unit Public Health Laboratory, Department of Microbiology & Immunology, The University of Melbourne at The Doherty Institute for Infection and Immunity, Melbourne, Australia
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DOI: 10.1128/AAC.02012-17
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ABSTRACT

Australia has high and increasing rates of salmonellosis. To date, the serovar distribution and associated antimicrobial resistance (AMR) patterns of nontyphoidal Salmonella enterica (NTS) in Australia have not been assessed. Such information provides critical knowledge about AMR in the food chain and informs decisions about public health. We reviewed longitudinal data on NTS in two Australian states over a 37-year period, between 1979 and 2015, and antimicrobial resistance since 1984. Overall, 17% of isolates were nonsusceptible to at least one antimicrobial, 4.9% were nonsusceptible to ciprofloxacin, and 0.6% were nonsusceptible to cefotaxime. In total, 2.5% of isolates were from invasive infections, with no significant difference in AMR profiles between invasive and noninvasive isolates. Most isolates with clinically relevant AMR profiles were associated with travel, particularly to Southeast Asia, with multiple “incursions” of virulent and resistant clones into Australia. Our findings represent the largest longitudinal surveillance system for NTS in Australia and provide valuable public health knowledge on the trends and distribution of AMR in NTS. Ongoing surveillance is critical to identify local emergence of resistant isolates.

FOOTNOTES

    • Received 28 September 2017.
    • Returned for modification 17 October 2017.
    • Accepted 13 November 2017.
    • Accepted manuscript posted online 27 November 2017.
  • Supplemental material for this article may be found at https://doi.org/10.1128/AAC.02012-17.

  • Copyright © 2018 Williamson et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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Increasing Antimicrobial Resistance in Nontyphoidal Salmonella Isolates in Australia from 1979 to 2015
Deborah A. Williamson, Courtney R. Lane, Marion Easton, Mary Valcanis, Janet Strachan, Mark G. Veitch, Martyn D. Kirk, Benjamin P. Howden
Antimicrobial Agents and Chemotherapy Jan 2018, 62 (2) e02012-17; DOI: 10.1128/AAC.02012-17

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Increasing Antimicrobial Resistance in Nontyphoidal Salmonella Isolates in Australia from 1979 to 2015
Deborah A. Williamson, Courtney R. Lane, Marion Easton, Mary Valcanis, Janet Strachan, Mark G. Veitch, Martyn D. Kirk, Benjamin P. Howden
Antimicrobial Agents and Chemotherapy Jan 2018, 62 (2) e02012-17; DOI: 10.1128/AAC.02012-17
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KEYWORDS

Salmonella enterica
epidemiology
antimicrobial resistance
public health
Salmonella
surveillance studies
zoonotic infections

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