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Correlation of pneumococcal type 19F ELISA and opsonophagocytosis assay titers. (A) After C PS absorption. (B) After C PS plus type 22F PS absorption. The quadrant lines were drawn at the 1.0 μg/ml cutoff for the ELISA titer and the log2 (1:4) cutoff for the opsonophagocytosis assay titer. The r value was 0.63 before type 22F PS absorption and 0.80 after type 22F PS absorption.
