Figure 2

Proportion of A-allele carriers (18%, 43% and 63%) among donors reported to have had no malaria episode (no attack), 1–4 malaria episodes (1–4 attacks) or 5–7 episodes (≥5 attacks), respectively. The number of the malaria episodes was based on 9 years of surveillances in Daraweesh village. The differences in the proportions of the A-allele between the three groups was significant, P = 0.002, Chi-square test.