FIG. 1.

Competition for VlsE binding with the C6 peptide. Individual serum samples were incubated with increasing concentrations of peptide for 1 h prior to their addition to VlsE antigen-coated 96-well plates. Shown are OD₄₅₀ values obtained for each sample. Error bars represent the standard deviations of the means of triplicate determinations. The levels of inhibition with 1,000 ng C6 peptide/well added were as follows: NA6, 69%; NA8, 17%; NA10, 95%; NA11, 66%; NA12, 53%; NA13, 39%; NA15, 10%; and NA20, 15%.