High genetic diversity among community-associated Staphylococcus aureus in Europe: results from a multicenter study |
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Authors: | Rolo Joana Miragaia Maria Turlej-Rogacka Agata Empel Joanna Bouchami Ons Faria Nuno A Tavares Ana Hryniewicz Waleria Fluit Ad C de Lencastre Hermínia;CONCORD Working Group |
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Institution: | Laboratory of Molecular Genetics, Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Oeiras, Portugal. |
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Abstract: | BackgroundSeveral studies have addressed the epidemiology of community-associated
Staphylococcus aureus (CA-SA) in Europe; nonetheless, a
comprehensive perspective remains unclear. In this study, we aimed to
describe the population structure of CA-SA and to shed light on the origin
of methicillin-resistant S. aureus (MRSA) in this
continent.Methods and FindingsA total of 568 colonization and infection isolates, comprising both MRSA and
methicillin-susceptible S. aureus (MSSA), were recovered in
16 European countries, from community and community-onset infections. The
genetic background of isolates was characterized by molecular typing
techniques (spa typing, pulsed-field gel electrophoresis
and multilocus sequence typing) and the presence of PVL and ACME was tested
by PCR. MRSA were further characterized by SCCmec typing.
We found that 59% of all isolates were associated with
community-associated clones. Most MRSA were related with USA300 (ST8-IVa and
variants) (40%), followed by the European clone (ST80-IVc and
derivatives) (28%) and the Taiwan clone (ST59-IVa and related clonal
types) (15%). A total of 83% of MRSA carried Panton-Valentine
leukocidin (PVL) and 14% carried the arginine catabolic mobile
element (ACME). Surprisingly, we found a high genetic diversity among MRSA
clonal types (ST-SCCmec), Simpson’s index of
diversity?=?0.852 (0.788–0.916). Specifically,
about half of the isolates carried novel associations between genetic
background and SCCmec. Analysis by BURP showed that some
CA-MSSA and CA-MRSA isolates were highly related, suggesting a probable
local acquisition/loss of SCCmec.ConclusionsOur results imply that CA-MRSA origin, epidemiology and population structure
in Europe is very dissimilar from that of USA. |
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