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Public and Environmental Health Microbiology

Methicillin-Resistant Staphylococcus aureus Sequence Type (ST) 5 Isolates from Health Care and Agricultural Sources Adhere Equivalently to Human Keratinocytes

Samantha J. Hau, Steven Kellner, Kirsten C. Eberle, Ursula Waack, Susan L. Brockmeier, Jisun S. Haan, Peter R. Davies, Timothy Frana, Tracy L. Nicholson
Edward G. Dudley, Editor
Samantha J. Hau
aDepartment of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
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Steven Kellner
bNational Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa, USA
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Kirsten C. Eberle
bNational Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa, USA
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Ursula Waack
bNational Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa, USA
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Susan L. Brockmeier
bNational Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa, USA
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Jisun S. Haan
cEnterics Unit, Infectious Disease Lab, Public Health Laboratory Division, Minnesota Department of Health, St. Paul, Minnesota, USA
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Peter R. Davies
dDepartment of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota, USA
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Timothy Frana
aDepartment of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
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Tracy L. Nicholson
bNational Animal Disease Center, Agricultural Research Service, U.S. Department of Agriculture, Ames, Iowa, USA
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Edward G. Dudley
The Pennsylvania State University
Roles: Editor
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DOI: 10.1128/AEM.02073-17
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ABSTRACT

Staphylococcus aureus is part of the nasal microbiome of many humans and has become a significant public health burden due to infections with antibiotic-resistant strains, including methicillin-resistant S. aureus (MRSA) strains. Several lineages of S. aureus, including MRSA, are found in livestock species and can be acquired by humans through contact with animals. These livestock-associated MRSA (LA-MRSA) isolates raise public health concerns because of the potential for livestock to act as reservoirs for MRSA outside the hospital setting. In the United States, swine harbor a mixed population of LA-MRSA isolates, with the sequence type 398 (ST398), ST9, and ST5 lineages being detected. LA-MRSA ST5 isolates are particularly concerning to the public health community because, unlike the isolates in the ST398 and ST9 lineages, isolates in the ST5 lineage are a significant cause of human disease in both the hospital and community settings globally. The ability of swine-associated LA-MRSA ST5 isolates to adhere to human keratinocytes in vitro was investigated, and the adherence genes harbored by these isolates were evaluated and compared to those in clinical MRSA ST5 isolates from humans with no swine contact. The two subsets of isolates adhered equivalently to human keratinocytes in vitro and contained an indistinguishable complement of adherence genes that possessed a high degree of sequence identity. Collectively, our data indicate that, unlike LA-MRSA ST398 isolates, LA-MRSA ST5 isolates do not exhibit a reduced genotypic or phenotypic capacity to adhere to human keratinocytes.

IMPORTANCE Our data indicate that swine-associated livestock-associated methicillin-resistant Staphylococcus aureus (LA-MRSA) ST5 isolates are as capable of adhering to human skin and have the same genetic potential to adhere as clinical MRSA ST5 isolates from humans. This suggests that humans in contact with livestock have the potential to become colonized with LA-MRSA ST5 isolates; however, the genes that contribute to the persistence of S. aureus on human skin were absent in LA-MRSA ST5 isolates. The data presented here are important evidence in evaluating the potential risks that LA-MRSA ST5 isolates pose to humans who come into contact with livestock.

FOOTNOTES

    • Received 19 September 2017.
    • Accepted 28 October 2017.
    • Accepted manuscript posted online 3 November 2017.
  • Supplemental material for this article may be found at https://doi.org/10.1128/AEM.02073-17.

  • Copyright © 2018 American Society for Microbiology.

All Rights Reserved.

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Methicillin-Resistant Staphylococcus aureus Sequence Type (ST) 5 Isolates from Health Care and Agricultural Sources Adhere Equivalently to Human Keratinocytes
Samantha J. Hau, Steven Kellner, Kirsten C. Eberle, Ursula Waack, Susan L. Brockmeier, Jisun S. Haan, Peter R. Davies, Timothy Frana, Tracy L. Nicholson
Applied and Environmental Microbiology Jan 2018, 84 (2) e02073-17; DOI: 10.1128/AEM.02073-17

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Methicillin-Resistant Staphylococcus aureus Sequence Type (ST) 5 Isolates from Health Care and Agricultural Sources Adhere Equivalently to Human Keratinocytes
Samantha J. Hau, Steven Kellner, Kirsten C. Eberle, Ursula Waack, Susan L. Brockmeier, Jisun S. Haan, Peter R. Davies, Timothy Frana, Tracy L. Nicholson
Applied and Environmental Microbiology Jan 2018, 84 (2) e02073-17; DOI: 10.1128/AEM.02073-17
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KEYWORDS

LA-MRSA
Staphylococcus aureus
swine

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