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Iron status predicts malaria risk in Malawian preschool children
Femkje A M Jonker1, Job C J Calis, Michael Boele van Hensbroek
1Global Child Health Group, Emma Children's Hospital, Academic Medical Centre, Amsterdam, The Netherlands. femkje.jonker@live.nl
Insights
Iron deficiency in preschool children may protect against malaria. This study suggests careful consideration of iron treatment benefits versus risks in malaria-endemic regions.
Area of Science:
- Pediatric infectious diseases
- Nutritional immunology
- Global child health
Background:
- Iron deficiency is common in preschool children in developing countries, particularly sub-Saharan Africa.
- The relationship between iron status and malaria risk is debated, with limited data and potential biases in existing studies.
- Recent research has focused on iron supplementation risks, leaving the impact of an individual's iron status on malaria susceptibility unclear.
Purpose of the Study:
- To evaluate the predictive value of baseline iron deficiency for malaria risk in preschool children.
- To address potential biases, including inflammation-induced misclassification of iron status and unmeasured confounding, using causal inference methods.
- To provide evidence for informed clinical decisions regarding iron deficiency treatment in malaria-endemic areas.
Main Methods:
- Prospective cohort study of 727 Malawian preschool children over one year.
- Iron deficiency defined as serum ferritin <30 µg/L.
- Analysis using marginal structural Cox regression models with confounder selection guided by causal graph theory.
- Sensitivity analyses conducted to assess bias from iron status misclassification and unmeasured confounding.
Main Results:
- Overall incidence of malaria parasitemia and clinical malaria was 1.9 and 0.7 events per person-year, respectively.
- Children with baseline iron deficiency exhibited a reduced incidence of malaria parasitemia (aHR 0.55) and clinical malaria (aHR 0.49) over the follow-up period.
- Adjusted hazard ratios indicated a significant protective association between iron deficiency and malaria outcomes.
Conclusions:
- Iron deficiency appears to confer protection against malaria parasitemia and clinical malaria in young children.
- The clinical benefits of treating iron deficiency in preschool children in malaria-endemic areas warrant careful consideration against potential risks.
- Integrated strategies for iron deficiency treatment and malaria prevention are crucial in these regions.
Introduction:
Iron deficiency is highly prevalent in pre-school children in developing countries and an important health problem in sub-Saharan Africa. A debate exists on the possible protective effect of iron deficiency against malaria and other infections; yet consensus is lacking due to limited data. Recent studies have focused on the risks of iron supplementation but the effect of an individual's iron status on malaria risk remains unclear. Studies of iron status in areas with a high burden of infections often are exposed to bias. The aim of this study was to assess the predictive value of baseline iron status for malaria risk explicitly taking potential biases into account.
Methods And Materials:
We prospectively assessed the relationship between baseline iron deficiency (serum ferritin <30 µg/L) and malaria risk in a cohort of 727 Malawian preschool children during a year of follow-up. Data were analyzed using marginal structural Cox regression models and confounders were selected using causal graph theory. Sensitivity of results to bias resulting from misclassification of iron status by concurrent inflammation and to bias from unmeasured confounding were assessed using modern causal inference methods.
Results And Conclusions:
The overall incidence of malaria parasitemia and clinical malaria was 1.9 (95% CI 1.8-2.0) and 0.7 (95% CI 0.6-0.8) events per person-year, respectively. Children with iron deficiency at baseline had a lower incidence of malaria parasitemia and clinical malaria during a year of follow-up; adjusted hazard ratio's 0.55 (95%-CI:0.41-0.74) and 0.49 (95%-CI:0.33-0.73), respectively. Our results suggest that iron deficiency protects against malaria parasitemia and clinical malaria in young children. Therefore the clinical importance of treating iron deficiency in a pre-school child should be weighed carefully against potential harms. In malaria endemic areas treatment of iron deficiency in children requires sustained prevention of malaria.
