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Published in: European Journal of Clinical Microbiology & Infectious Diseases 8/2010

01-08-2010 | Article

Clinical and laboratory features of invasive community-onset methicillin-resistant Staphylococcus aureus infection: a prospective case–control study

Authors: M. C. Wehrhahn, J. O. Robinson, J. C. Pearson, F. G. O’Brien, H. L. Tan, G. W. Coombs, E. M. Pascoe, R. Lee, P. Salvaris, R. Salvaris, D. New, R. J. Murray

Published in: European Journal of Clinical Microbiology & Infectious Diseases | Issue 8/2010

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Abstract

Differences between the features of invasive community-onset methicillin-resistant Staphylococcus aureus (cMRSA) and methicillin-susceptible S. aureus (cMSSA) infections are incompletely understood. Fifty-seven patients with invasive cMRSA infection were prospectively identified at two teaching hospitals; for each cMRSA case, two cases of invasive cMSSA infection acted as controls. The primary outcome was 30-day all-cause mortality. Patients with invasive cMRSA infection were more likely to be Aboriginal (25% vs. 14%, age-adjusted odds ratio [OR] 2.5, p = 0.037), reside in a long-term care facility and/or have been hospitalised in the previous year (51% vs. 34%, p = 0.04) and less likely to have endocarditis (2% vs. 12%, p = 0.02) or require admission to an intensive care unit or high-dependency area (7% vs. 21%, p = 0.02). All-cause mortality at 30 days was similar in the cMRSA and cMSSA groups (9% vs. 7%, p = 0.68). Panton–Valentine leukocidin (PVL) genes were detected in a similar proportion of cMRSA and cMSSA isolates (32% vs. 27%, p = 0.49) and the presence of PVL genes was associated with younger age (35 years vs. 55 years, p < 0.001), Aboriginal ethnicity (38% vs. 10%, p < 0.001), skin and soft-tissue infection (54% vs. 19%, p < 0.001), lower illness severity at presentation (SAPS II score 9 vs. 21, p = 0.001) and shorter hospitalisation (9 days vs. 24 days, p < 0.001). Patients with “PVL-positive” and “PVL-negative” S. aureus infection had similar 30-day all-cause mortality (4% vs. 9%, p = 0.28). Few clinical features differentiated patients with invasive cMRSA infection from those with infection caused by cMSSA. Invasive “PVL-positive” S. aureus infection was associated with less morbidity but similar mortality to “PVL-negative” infection.
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Metadata
Title
Clinical and laboratory features of invasive community-onset methicillin-resistant Staphylococcus aureus infection: a prospective case–control study
Authors
M. C. Wehrhahn
J. O. Robinson
J. C. Pearson
F. G. O’Brien
H. L. Tan
G. W. Coombs
E. M. Pascoe
R. Lee
P. Salvaris
R. Salvaris
D. New
R. J. Murray
Publication date
01-08-2010
Publisher
Springer-Verlag
Published in
European Journal of Clinical Microbiology & Infectious Diseases / Issue 8/2010
Print ISSN: 0934-9723
Electronic ISSN: 1435-4373
DOI
https://doi.org/10.1007/s10096-010-0973-4

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