Fig. 4From: Malaria in pregnancy: a passive surveillance study of pregnant women in low transmission areas of Colombia, Latin AmericaAntibody response against Plasmodium antigens during patent malaria infection. Response against PvCS, PvMSP-1, PfCS and PfMSP-1 was determined by ELISA. Values are expressed as reactivity index (RI) defined as sample OD at 1:200 serum dilutions divided by the cut-off value. Solid lines show the median RI in each groupBack to article page