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Updated: May 11, 2026

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Published on: January 9, 2026
The gut mucosal immune system in the neonatal period
Anna J Battersby1, Deena L Gibbons
1Academic Department of Paediatrics, Imperial College London, London, UK. a.battersby@imperial.ac.uk
Insights
Newborns
Area of Science:
- Neonatal immunology
- Pediatric infectious diseases
- Gastrointestinal immunology
Background:
- Invasive sepsis in newborns is a significant global cause of illness and death.
- The infant immune system is developing, not deficient, with unique characteristics.
- The infant gut mucosal immune system is intricate and exhibits clinically relevant irregularities.
Purpose of the Study:
- To explore the complexities of the infant gut mucosal immune system.
- To understand the factors influencing this system, including the microbiome and maternal factors.
- To highlight the need for research into immune cell distribution and function in infants.
Main Methods:
- Review of current understanding of infant immunology.
- Analysis of factors modulating the infant gut mucosal immune system.
- Emphasis on phenotypic and functional characterization of immune cells.
Main Results:
- The infant immune system possesses competencies but differs from adult systems.
- The gut mucosal immune system shows phenotypic and functional variations.
- Factors like the gut microbiome, nutrition, and maternal immunity play crucial roles.
Conclusions:
- Understanding the infant gut mucosal immune system is critical for addressing neonatal sepsis.
- Further research into immune cell phenotypes, functions, and pathways is essential.
- This knowledge will advance infant immunology and clinical care.
Abstract:
Invasive sepsis in the newborn period is a major cause of childhood morbidity and mortality worldwide. The infant immune system undoubtedly differs intrinsically from the mature adult immune system. Current understanding is that the newborn infant immune system displays a range of competencies and is developing rather than deficient. The infant gut mucosal immune system is complex and displays a plethora of phenotypic and functional irregularities that may be clinically important. Various factors affect and modulate the infant gut mucosal immune system: components of the intestinal barrier, the infant gut microbiome, nutrition and the maternal-infant hybrid immune system. Elucidation of the phenotypic distribution of immune cells, their functional significance and the mucosa-specific pathways used by these cells is essential to the future of research in the field of infant immunology.
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