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In an opsonophagocytic assay with purified neutrophils and complement, the LH/HC isolate again demonstrated a higher survival index than the HH/ LC phenotype (p = 0.
The primary objective of this study was to demonstrate that the immune response to Prevenar 13 in the 18 to 49 year old age group is noninferior to the immune response to Prevenar 13 in the 60 to 64 year old age group as measured by serotype specific opsonophagocytic assay (OPA) titers one month after vaccination.
35 mcg/mL) and functional opsonophagocytic assay (OPA) after vaccination with Prevenar or Prevenar 13.