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Determination of antibody levels in plasma samples to rPV24 by ELISA. (a) Different groups of human plasmas; sera of P vivax infected patients (PV), malaria naïve sera (N), and sera of P falciparum infected patients (PF). (b) plasma from PV collected in different years compared with N. (c) Antibody levels during acute infection and convalescence period collected at 3 and 6 months after treatment (dash line indicates cut-off level at mean + 3 standard deviation).
