CD55 and malaria: CD55 levels correlated significantly with the level of haemoglobin in anaemic (Spearman rank test: young RBC, r = 0.506, P = 0.001; mature RBC, r = 0.421, P = 0.0063; old RBC, r = 0.526, P = 0.0008; very old RBC, r = 0.375, P = 0.0246) but not in non-anaemic children with malaria.