Absence of Association Between Sickle Trait Hemoglobin and Placental Malaria Outcomes

Area of Science:

• Malaria research
• Hematology
• Obstetrics

Background:

• Sickle trait (HbAS) is known to protect children against severe falciparum malaria.
• Placental malaria (PM) is a significant cause of adverse birth outcomes, including low birth weight (LBW).
• The binding of Plasmodium-infected red blood cells (iRBCs) to ligands is crucial in PM pathogenesis.

Purpose of the Study:

• To investigate whether sickle trait (HbAS) is associated with a reduced risk of placental malaria (PM) and low birth weight (LBW) in pregnant women.
• To evaluate the protective effect of HbAS against P. falciparum infection in placental and peripheral blood.
• To assess the association of HbAS with histological evidence of PM and infant birth weight.

Main Methods:

• A study was conducted on 850 delivering women in southern Malawi.
• Parasite detection utilized polymerase chain reaction (PCR) in placental and peripheral blood.
• Placentae were histologically scored for evidence of PM.

Main Results:

• The prevalence of HbAS was 3.7%, and 11.2% of infants were LBW.
• HbAS was not associated with a reduced prevalence of P. falciparum in placental or peripheral blood.
• No significant association was found between HbAS and histological PM or LBW, with similar mean birth weights observed for HbAS and non-HbAS mothers.

Conclusions:

• Sickle trait (HbAS) did not confer protection against placental malaria (PM) in this Malawian cohort.
• HbAS was not associated with a reduced risk of low birth weight (LBW) or P. falciparum infection.
• The findings suggest HbAS does not protect against PM or its adverse effects in pregnant women.