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Age-related increase in IRPA against strain 44/76-SL (B:15:P1.7,16). Sera collected from Finnish children of the four indicated ages were used (n = 5/group). Horizontal lines, GMs of PIs at different ages; horizontal dotted line, designated cutoff value (PI = 10) for IRPA. Datum points are separated by 10% (i.e., jittered) to show individual datum points.
