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Reproducibility within laboratories of serology assay results for assays detecting antibodies to A(H1N1)pdm09 (A and B) and A(H3N2) and A(H5N1) (C and D) viruses. Graphs show the (percent) proportions of replicate assays differing by >2-fold (A and C) and >4-fold (B and D) for the 2-day ELISA MN assay and the 3-day MN assay with detection by HA and CPE for each participating laboratory for all sera. ND indicates instances in which the assay or detection method was not performed.
