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Plots of the Merck titers (averaged across the runs) versus the reported titers for Goldblatt sera (9). Results for the Goldblatt serum calibration are reported for only 7 of the 12 serotypes (available at the following website: http://www.vaccine.uab.edu/qc3.pdf). The dotted lines represent the agreement criterion ±1.4-fold. The comparison was performed as described in Materials and Methods.
