Association of the sickle cell trait and the ABO blood group with clinical severity of malaria in southwest Nigeria.

In regions of high Plasmodium falciparum malaria endemicity, certain erythrocyte polymorphisms confer resistance to severe disease. In this study, we evaluate the role of the sickle cell trait (HbS) and ABO blood groups in the clinical manifestations of childhood malaria in Southwest Nigeria. The subjects comprised 3100 children (53% males, median age 39 months), including 1400 children with uncomplicated malaria, 1000 children with asymptomatic malaria and 700 with severe malaria. Haemoglobin (Hb) types were determined using electrophoresis and serum agglutination techniques were used to determine ABO blood groups. Blood group O was the commonest ABO blood group (47.7%) in the study population, the others were A (22.5%), B (25.2%) and AB (4.6%). The frequencies of the HbAS and HbAC were 14.4% and 5.8%, respectively. In regression models adjusting for age, gender, parasite density and blood group, HbAS was associated with a reduced risk of severe malaria OR=0.46 (CI(95%): 0.273-0.773). Among severe malaria subjects, HbAS was associated with significantly lower parasite densities. The protective effect of blood group O was demonstrated with a decreased risk of severe malaria OR=0.743 (CI(95%): 0.566-0.976) after adjusting for age, gender and parasite density and Hb genotype. Blood group B was associated with increased risk of severe malaria OR=1.638 (CI(95%): 1.128-2.380) after adjusting for age, gender, packed cell volume, parasite density and Hb genotype. We have confirmed from this large study of Nigerian children the major protective effective of the sickle cell heterozygous state against both cerebral malaria and severe malarial anaemia. We also show that the B blood group is associated with an increased risk of severe malaria. In conclusion, the sickle cell haemoglobin type and ABO groups modulate the risk of severe malaria in Nigerian children.

Amodu OK ，Olaniyan SA ，Adeyemo AA ，Troye-Blomberg M ，Olumese PE ，Omotade OO ... -  《-》

The role of red blood cell polymorphisms in resistance and susceptibility to malaria.

Lell B ，May J ，Schmidt-Ott RJ ，Lehman LG ，Luckner D ，Greve B ，Matousek P ，Schmid D ，Herbich K ，Mockenhaupt FP ，Meyer CG ，Bienzle U ，Kremsner PG ... -  《CLINICAL INFECTIOUS DISEASES》

Comparative haematological parameters of HbAA and HbAS genotype children infected with Plasmodium falciparum malaria in Yemen.

Albiti AH ，Nsiah K 《-》

Frequencies of some human genetic markers and their association with Plasmodium falciparum malaria in the Niger Delta, Nigeria.

Jeremiah ZA ，Jeremiah TA ，Emelike FO 《JOURNAL OF VECTOR BORNE DISEASES》

Erythrocyte rosetting in Plasmodium falciparum malaria--with special reference to the pathogenesis of cerebral malaria.

Carlson J 《-》