EDTA-treated human blood was incubated in microtitre wells containing either S. aureus USA300 biofilm, 5HE-C14-TMA (at 256 mg/L) only or biofilm with 5HE-C14-TMA (at 256 mg/L) and incubated for 2 h at 37 °C. Plasma samples were collected by centrifugation (1000 g) and assayed for human cytokines using a Bio-Plex 200 (Bio-Rad). A standard curve was employed to maximize sensitivity for samples containing low cytokine levels. At least three different donor blood samples (with three replicates for each) were used.
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