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MALDI-TOF MS typing of a nosocomial methicillin-resistant Staphylococcus aureus outbreak in a neonatal intensive care unit.

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Steensels, Deborah [UCL] Deplano, Ariane Denis, Olivier Simon, Anne [UCL] Verroken, Alexia [UCL]

(eng) Background: The early detection of a methicillin-resistant Staphylococcus aureus (MRSA) outbreak is decisive to control its spread and rapidly initiate adequate infection control measures. Therefore, prompt determination of epidemiologic relatedness of clinical MRSA isolates is essential. Genetic typing methods have a high discriminatory power but their availability remains restricted. In this study, we aimed to challenge matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) as a typing tool of a nosocomial MRSA outbreak in a neonatal intensive care unit. Methods: Over a 2-year period, 15 MRSA isolates were recovered from patients (n = 14) and health care workers (n = 1) at the neonatal intensive care unit. Five reference strains were included for comparison. Identification was performed by MALDI-TOF MS and susceptibility profiles determined by automated broth microdilution. Typing analysis by MALDI-TOF MS included mean spectrum profiles and subsequent dendrogram creation using BioNumerics software. Results were compared with spa typing and pulsed-field gel electrophoresis (PFGE). Results: Our study showed good concordance (93%) between PFGE, spa typing, and MALDI-TOF MS for the outbreak-related MRSA strains. MALDI-TOF MS typing showed excellent typeability and discriminatory power but showed poor reproducibility. Conclusions: This study is one of the first to document the potential usefulness of MALDI-TOF MS with standardized data analysis as a typing tool for investigating a nosocomial MRSA outbreak. A concordance of 93% compared to reference typing techniques was observed. However, because of poor reproducibility, long-term follow-up of prospective isolated strains is not practical for routine use. Further studies are needed to confirm our observations.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2017
Language Anglais
Journal information "Acta clinica Belgica" - Vol. 72, no. 4, p. 219-225 (2017)
Peer reviewed yes
Publisher Taylor & Francis ((United Kingdom) Abingdon)
issn 1784-3286
e-issn 2295-3337
Publication status Publié
Affiliations UCL - SSS/IREC/MBLG - Pôle de Microbiologie médicale
UCL - (SLuc) Service de microbiologie
Keywords MALDI-TOF MS ; MRSA ; Nosocomial outbreak ; Standardized data analysis ; Typing
Links
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Bibliographic reference Steensels, Deborah ; Deplano, Ariane ; Denis, Olivier ; Simon, Anne ; Verroken, Alexia. MALDI-TOF MS typing of a nosocomial methicillin-resistant Staphylococcus aureus outbreak in a neonatal intensive care unit.. In: Acta clinica Belgica, Vol. 72, no. 4, p. 219-225 (2017)
Permanent URL http://hdl.handle.net/2078.1/184665