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Epidemiol Infect. 2016 Nov;144(15):3198-3204. Epub 2016 Aug 4.

Predictors of community-associated Staphylococcus aureus, methicillin-resistant and methicillin-susceptible Staphylococcus aureus skin and soft tissue infections in primary-care settings.

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College of Pharmacy, The University of Texas at Austin,Austin, TX,USA.
Texas Tech University Health Sciences Center,School of Pharmacy,Dallas, TX,USA.
Department of Clinical Laboratory Sciences,School of Health Professions,University of Texas Health Science Center,San Antonio, TX,USA.
South Texas Ambulatory Research Network, The University of Texas Health Science Center,San Antonio, TX,USA.
Department of Clinical Pathology and Genomic Medicine,Methodist Research Institute,Houston, TX,USA.
Department of Biology,The University of Texas San Antonio,San Antonio, TX,USA.


Skin and soft tissue infections (SSTIs) due to Staphylococcus aureus have become increasingly common in the outpatient setting; however, risk factors for differentiating methicillin-resistant S. aureus (MRSA) and methicillin-susceptible S. aureus (MSSA) SSTIs are needed to better inform antibiotic treatment decisions. We performed a case-case-control study within 14 primary-care clinics in South Texas from 2007 to 2015. Overall, 325 patients [S. aureus SSTI cases (case group 1, n = 175); MRSA SSTI cases (case group 2, n = 115); MSSA SSTI cases (case group 3, n = 60); uninfected control group (control, n = 150)] were evaluated. Each case group was compared to the control group, and then qualitatively contrasted to identify unique risk factors associated with S. aureus, MRSA, and MSSA SSTIs. Overall, prior SSTIs [adjusted odds ratio (aOR) 7·60, 95% confidence interval (CI) 3·31-17·45], male gender (aOR 1·74, 95% CI 1·06-2·85), and absence of healthcare occupation status (aOR 0·14, 95% CI 0·03-0·68) were independently associated with S. aureus SSTIs. The only unique risk factor for community-associated (CA)-MRSA SSTIs was a high body weight (⩾110 kg) (aOR 2·03, 95% CI 1·01-4·09).


Staphylococcus aureus ; Epidemiology; soft tissue infections

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