FIGURE 2.

Examples of the associations between Ab levels and age or concurrent parasitemia. Selected examples of the relationship between Ab levels (relative OD) to specific Ags and age (children ≤9 y or >9 y of age) (A) or concurrent parasitemia (PCR negative, PCR positive) (B). Bar graphs show the relative OD and interquartile range for IgG responses against merozoite Ags MSPDBL1, ABRA/MSP9, Ripr, PfRh5, RON2 (left to right). Relative OD was calculated as proportion of absolute OD compared with the median OD of the cohort. Mann–Whitney U test was used to assess the difference in median values (p < 0.05 in all cases comparing younger versus older children or PCR-negative versus PCR-positive children). The associations between Ab prevalence and age or concurrent parasitemia are shown for all Ags in Table II.