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Of samples assayed in nonreference laboratories,100% showed median titers that were within 2-fold of the reference laboratory titer. Ten sera were tested per virus. Reference laboratory titers represented the median of 12 HAI determinations. Nonreference laboratory titers represented the median of 40 (H1N1; left panel) or 28 (H3N2; right panel) determinations. Dotted lines show the line of equality.
