Correlation between resistance mechanisms in Staphylococcus aureus and cell wall and septum thickening

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2017
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Abstract
Correlation between resistance mechanisms in Staphylococcus aureus and cell wall and septum thickening Ana Belén García,1 José Manuel Viñuela-Prieto,1 Laura López-González,1 Francisco Javier Candel1,2 1Department of Clinical Microbiology, Hospital Clínico San Carlos, Complutense University, Madrid, Spain; 2Health Research Institute, Hospital Universitario San Carlos, Madrid, Spain Purpose: The aim of the present study is to examine cell wall and septum thickening of methicillin-sensitive Staphylococcus aureus (MSSA), methicillin-resistant S. aureus (MRSA), and methicillin- and linezolid-resistant S. aureus (MLRSA) isolates by transmission electron microscopy to correlate the association of resistance mechanisms with major changes in the morphology of membrane or septum.Materials and methods: MSSA, MRSA, and MLRSA strains obtained from clinical samples of an outbreak that occurred in 2010 at the Intensive Care Unit of our Hospital were thawed and sown at 37°C in blood agar overnight. After that, they were washed, pelleted, and treated with a fixer solution. Pellets were dehydrated and finally embedded in resin. Transmission electron microscopy was used to characterize cell wall and septum thickening in all isolates. The comparison between the measurements obtained for each group was performed by a Kruskal–Wallis test and a post hoc Dunn–Bonferroni’s pairwise comparison method.Results: Differences in cell wall and septum thickness were statistically significant (P<0.001 and P<0.001, respectively) between the three groups. Moreover, significant differences were detected in wall and septum thickness between the MSSA and MRSA strains (P<0.001 and P<0.001, respectively) and between the MSSA and MLRSA strains (P<0.001 and P<0.001, respectively) but not between the MRSA and MLRSA strains (P
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Authors Ana Belén García;José Manuel Viñuela-Prieto;Laura López-González;Francisco Javier Candel and
Journal Infection and drug resistance
Year 2017
DOI
10.2147/IDR.S146748
URL
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