Abstract
Staphylococcal superantigens (SAg) could play an important role in sepsis by activating numerous T cells. We investigated whether serum capacity to neutralize SAgs can be a prognostic factor in Staphylococcus aureus bacteremia (SAB). In a university hospital, 105 consecutive SAB patients were enrolled during a 12-month period. The earliest serum samples prior to SAB onset were stored for a later T cell proliferation assay. Multiplex polymerase chain reaction (PCR) for 19 SAg genes was performed for S. aureus blood isolates. To determine the serum capacity to neutralize SAgs, T cell proliferation by the culture supernatant of each S. aureus isolate was measured in the presence and absence of the corresponding patient’s serum. Twenty-six (24.8%) patients died within 4 weeks from SAB onset. Vascular catheter-related infection was associated with survival for ≥4 weeks. Unknown primary focus, Simplified Acute Physiology Score-II (SAPS-II), and specific SAg genes (tst, sec, sel, or sep) were associated with the 4-week mortality. No variables related to T cell proliferation assay showed statistical significance. In the multivariate analysis, SAPS-II ≥33 and tst were independently associated with the 4-week mortality. Serum capacity to neutralize SAg does not significantly affect SAB outcome. SAPS-II ≥33 and tst are independent predictors of the 4-week mortality.
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Acknowledgment
This work was supported by grant no. 03-2007-031 from the Seoul National University Hospital (SNUH) Research Fund.
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The authors declare that they have no conflict of interest.
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Yi, J., Park, J.S., Hong, KH. et al. Serum capacity to neutralize superantigens does not affect the outcome of Staphylococcus aureus bacteremia. Eur J Clin Microbiol Infect Dis 31, 2061–2068 (2012). https://doi.org/10.1007/s10096-011-1541-2
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DOI: https://doi.org/10.1007/s10096-011-1541-2