Congenital Malaria and Infant Immunology
Summary
Congenital malaria arises when Plasmodium parasites cross the placental barrier, leading to infection of the foetus or newborn. Although often under-diagnosed, it contributes to neonatal morbidity and mortality in endemic regions and poses diagnostic challenges in non-endemic settings. The neonatal immune system is shaped by maternally transferred immunoglobulin G (IgG), innate cellular mechanisms and in utero antigen exposure. Maternal antibodies confer early protection but typically wane by six months, creating a window of vulnerability before active immunity develops. In utero exposure may induce immune sensitisation or tolerance, with lasting effects on susceptibility and vaccine responsiveness. Innate responses, including phagocytosis and innate lymphoid cell activity, provide an initial defence, while adaptive T and B cell functions mature over time. Advances in understanding antibody kinetics, the role of IgM in early life and the impact of placental inflammation on foetal immune programming are informing vaccine strategies, passive immunisation and intermittent preventive treatment in pregnancy. A coordinated approach to maternal and infant immunology is essential for reducing neonatal malaria burden, refining treatment guidelines and guiding paediatric vaccine development.
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Congenital Malaria and Infant Immunology publication trend
The graph below shows the total number of articles in congenital malaria and infant immunology across all publications each year (not limited to Nature Index journals).
Technical terms
Congenital malaria: Infection of the foetus or newborn by Plasmodium parasites transmitted across the placenta or during birth.
Placental malaria: Sequestration of infected erythrocytes in the placenta, causing inflammation and altered foetal immune exposure.
Maternal antibodies: Immunoglobulins, primarily IgG, transferred from mother to foetus that provide passive immunity.
Immune tolerance: A state of unresponsiveness of the immune system to specific antigens encountered in utero.
IgG: Immunoglobulin class that crosses the placenta and mediates long-term adaptive immunity.
IgM: Immunoglobulin class produced by the infant’s own immune system, indicative of primary responses.
Parasitaemia: The presence and density of Plasmodium parasites in the bloodstream.
References
- Dynamics of IgG antibody response against Plasmodium antigens among Nigerian infants and young children. Frontiers in Immunology (2023).
- IgG and IgM responses to the Plasmodium falciparum asexual stage antigens reflect respectively protection against malaria during pregnancy and infanthood. Malaria Journal (2024).
- Can Prenatal Malaria Exposure Produce an Immune Tolerant Phenotype?: A Prospective Birth Cohort Study in Kenya. PLOS Medicine (2009).
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