FIG. 3.

Dose-response effect of type III GBS CPS-specific IgG on mean (± SEM) NADG-mediated lectin site inhibition. Increasing concentrations of type III GBS CPS-specific IgG were added to a reaction mixture in the setting of 100 mM NADG-mediated lectin site inhibition. Inhibition of opsonophagocytosis was complete at type III GBS CPS-specific antibody concentrations of <0.8 μg/ml, was partial at concentrations of 0.8 and 1.5 μg/ml, and was absent at concentrations of ≥3.3 μg/ml.