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Correlation between IgM of MAA and ELISA. Initial IgM (A) and later IgM (B) showed significant correlation between MAA and ELISA (p < 0.001 and p = 0.003). IgM titer was calculated to 1:1280, and high titers of ≥1:1280 were expressed as 1280 in MAA. r is Pearson’s correlation. Abbreviations: MAA, microparticle hemagglutinin assay; ELISA, enzyme-linked immunosorbent assay.
