Epidemiological and serological characteristics of the study population. (A) Parasite loads (percentage of P. falciparum-infected red blood cells) in the EC, AM and MM groups. (B) Correlation between total IgGs and age of the children in EC, AM and MM groups. (C) Levels of IgG recognizing total P. falciparum antigens in the EC, AM and MM groups. (D) Proportion of patients with >3 pg/ml of P. falciparum-specific IgG in the respective clinical groups.