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Serological responses to chikungunya infections. Anti-chikungunya immunoglobulin M and G (IgM and IgG) were measured using enzyme-linked immunosorbent assay (ELISA) and healthcare-associated infections (HAI). The quantitative PCR result is included in the graph to show antibody response in relationship to viremia. The error bars for the serological results reflect the standard error of the mean.
