Figure 4

Comparison between the surface reactivity (measured as percentage of IgG positive pRBCs), the rosetting rate (measured as percentage of multiplets) and the percentage of phagocytosis in the presence of pediatric sera when the pRBCs tested were grown in group O vs. group A RBCs. (A) The percentage of positive responders for each variable is depicted. Differences between the percentages for each group were determined using a chi-square test. (B) Measurements for each of the variables are represented and grouped by blood group used to grow the parasites tested. Differences between the two groups were determined using a Mann-Whitney unpaired test.