Quantitation of cell-associated and soluble CP5 or CP8 produced by clinical isolates of S. aureus cultivated in RMPI + 1% casamino acids. CP levels were measured by an ELISA inhibition method, and CP5 and CP8 concentrations are expressed relative to those of Reynolds (CP5) and Reynolds (CP8), respectively, which were included as reference strains on every assay. CP levels were compared by one-way ANOVA, and multiple comparisons were made to the reference strains Reynolds (CP5) and Reynolds (CP8). ***, P < 0.001; **, P < 0.01; *, P < 0.05.