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

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

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, …
European Journal of Clinical Microbiology & Infectious Diseases, Vol.29(8), pp.1025-1033
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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Collaboration types
Domestic collaboration
Citation topics
1 Clinical & Life Sciences
1.23 Antibiotics & Antimicrobials
1.23.173 MRSA and VRE
Web Of Science research areas
Infectious Diseases
Microbiology
ESI research areas
Microbiology
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