247273.fig.001
Figure 1: Distribution of antimalarial antibodies in subjects with possible clinical history of imported malaria. Antibody index represents the ratio OD/cut-off for each sample. Group no. 1: travellers potentially exposed to Plasmodium spp. and microscopically positive for malaria ( ); group no. 2: travellers potentially exposed to Plasmodium spp. and microscopically negative for malaria ( ); and group no. 3: control, healthy subjects ( ).