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Reproducibility of measurements of PP activity in sera from individual subjects. (A) Strain NZ98/254; (B) strain S3032. PP was measured in three independent assays, performed over 3 months on test sera diluted 1:4. Data from the first 14 subjects are shown, represented by three data points (X) per subject for each serum sample. Serum samples are labeled with the subject number followed by the letter A for preimmunization sera and B for postimmunization sera.
