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Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization

BACKGROUND: The bacterium Staphylococcus aureus constitutes one of the most important causes of nosocomial infections. One out of every three individuals naturally carries S. aureus in their anterior nares, and nasal carriage is associated with a significantly higher infection rate in hospital setti...

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Autores principales: Frech, Georges C, Munns, Denton, Jenison, Robert D, Hicke, Brian J
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500258/
https://www.ncbi.nlm.nih.gov/pubmed/22882800
http://dx.doi.org/10.1186/1756-0500-5-430
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author Frech, Georges C
Munns, Denton
Jenison, Robert D
Hicke, Brian J
author_facet Frech, Georges C
Munns, Denton
Jenison, Robert D
Hicke, Brian J
author_sort Frech, Georges C
collection PubMed
description BACKGROUND: The bacterium Staphylococcus aureus constitutes one of the most important causes of nosocomial infections. One out of every three individuals naturally carries S. aureus in their anterior nares, and nasal carriage is associated with a significantly higher infection rate in hospital settings. Nasal carriage can be either persistent or intermittent, and it is the persistent carriers who, as a group, are at the highest risk of infection and who have the highest nasal S. aureus cell counts. Prophylactic decolonization of S. aureus from patients’ noses is known to reduce the incidence of postsurgical infections, and there is a clear rationale for rapid identification of nasal S. aureus carriers among hospital patients. FINDINGS: A molecular diagnostic assay was developed which is based on helicase-dependent target amplification and amplicon detection by chip hybridization to a chip surface, producing a visible readout. Nasal swabs from 70 subjects were used to compare the molecular assay against culturing on “CHROMagar Staph aureus” agar plates. The overall relative sensitivity was 89%, and the relative specificity was 94%. The sensitivity rose to 100% when excluding low-count subjects (<100 S. aureus colony-forming units per swab). CONCLUSIONS: This molecular assay is much faster than direct culture and has sensitivity that is appropriate for identification of high-count (>100 S. aureus colony-forming units per swab) nasal S. aureus carriers who are at greatest risk for nosocomial infections.
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spelling pubmed-35002582012-11-17 Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization Frech, Georges C Munns, Denton Jenison, Robert D Hicke, Brian J BMC Res Notes Short Report BACKGROUND: The bacterium Staphylococcus aureus constitutes one of the most important causes of nosocomial infections. One out of every three individuals naturally carries S. aureus in their anterior nares, and nasal carriage is associated with a significantly higher infection rate in hospital settings. Nasal carriage can be either persistent or intermittent, and it is the persistent carriers who, as a group, are at the highest risk of infection and who have the highest nasal S. aureus cell counts. Prophylactic decolonization of S. aureus from patients’ noses is known to reduce the incidence of postsurgical infections, and there is a clear rationale for rapid identification of nasal S. aureus carriers among hospital patients. FINDINGS: A molecular diagnostic assay was developed which is based on helicase-dependent target amplification and amplicon detection by chip hybridization to a chip surface, producing a visible readout. Nasal swabs from 70 subjects were used to compare the molecular assay against culturing on “CHROMagar Staph aureus” agar plates. The overall relative sensitivity was 89%, and the relative specificity was 94%. The sensitivity rose to 100% when excluding low-count subjects (<100 S. aureus colony-forming units per swab). CONCLUSIONS: This molecular assay is much faster than direct culture and has sensitivity that is appropriate for identification of high-count (>100 S. aureus colony-forming units per swab) nasal S. aureus carriers who are at greatest risk for nosocomial infections. BioMed Central 2012-08-11 /pmc/articles/PMC3500258/ /pubmed/22882800 http://dx.doi.org/10.1186/1756-0500-5-430 Text en Copyright ©2012 Frech et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Short Report
Frech, Georges C
Munns, Denton
Jenison, Robert D
Hicke, Brian J
Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title_full Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title_fullStr Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title_full_unstemmed Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title_short Direct detection of nasal Staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
title_sort direct detection of nasal staphylococcus aureus carriage via helicase-dependent isothermal amplification and chip hybridization
topic Short Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500258/
https://www.ncbi.nlm.nih.gov/pubmed/22882800
http://dx.doi.org/10.1186/1756-0500-5-430
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