Figure 1From: Impact of age of first exposure to Plasmodium falciparum on antibody responses to malaria in children: a randomized, controlled trial in MozambiqueWeighted scatter plots of IgM levels by cross-sectional visit and treatment group. The area of the symbol is proportional to the number of observations. Red symbols correspond to IgM levels in those children with previous or current Plasmodium falciparum infection. Horizontal continuous and dashed lines indicate geometric means at 95% confidence interval.Back to article page