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Kinetics of antibody response (a) a graph showing variation in percentage of cases with detectable anti-chikungunya IgM by NIV MAC ELISA, Pune and SD BOLINE, Korea and neutralising antibody by CHIKV micro-neutralisation assay; b, c a plot of geometric mean titre (95% confidence interval) of 21 patients at follow up showing anti-chikungunya IgM persistently high neutralising antibody respectively
