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Functional antibody response against 33F and 33E following immunization with 23-valent pneumococcal polysaccharide vaccine (PPSV23). Opsonophagocytic index values against STREP33F (33F) and 212862 (33E) using matched preimmunization and postimmunization PPSV23 immunization sera samples from 14 adults. p-values are the results of a one-way analysis of variance (ANOVA) with Tukey’s multiple-comparison test.
