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Serum antibody response and opsonophagocytic activity. Healthy young volunteers (n=18) were immunized with Pneumovax®. Serum samples were obtained pre- and 4–6 weeks post-immunization. Serum samples were tested for PPS14 and PPS23F specific IgG, IgA, IgM (A) and opsonophagocytic activity (B). Serum antibody levels are expressed as μg/mL and opsonophagocytic activity is expressed as opsonophagocytic index.
