The immune system of preterm infants: an overview - Report - MDSpire

The immune system of preterm infants: an overview

  • By

  • Mirjam J. Esser

  • Sanne J. C. M. Claassen

  • Melania P. Ebrahimi

  • Stan Berkers

  • Tim G. A. M. Wolfs

  • Magdalena A. Berkowska

  • Gertjan J. A. Driessen

  • Else M. Bijker

  • June 5, 2026

  • 0 min

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Clinical Report: Understanding the Immune System in Preterm Infants

Overview

Preterm infants exhibit significant immune system immaturity, leading to increased infection risk and suboptimal vaccine responses. This review highlights the differences in both innate and adaptive immunity between preterm and term infants, emphasizing the need for targeted health strategies.

Background

Approximately 13 million infants are born preterm each year, with prematurity being a leading cause of neonatal mortality. The immaturity of the immune system in preterm infants contributes to high rates of infection-related morbidity and mortality. Understanding the immune development in this population is crucial for improving health outcomes and vaccination strategies.

Data Highlights

No numerical data available in the source material.

Key Findings

  • Preterm infants show significant immaturity in both innate and adaptive immune cells compared to term infants.
  • Reduced levels of antibodies and impaired vaccine responses are common in preterm infants.
  • Lower counts of neutrophils, monocytes, dendritic cells, and natural killer cells are observed in preterm neonates.
  • Neutrophils from preterm infants exhibit diminished phagocytic activity, potentially increasing infection risk.
  • Rapid maturation of the immune system occurs during the first year of life, reducing differences with term infants.

Clinical Implications

Healthcare professionals should be aware of the unique immunological vulnerabilities of preterm infants when developing care and vaccination strategies. Enhanced infection prevention measures and tailored immunization schedules are essential for this population.

Conclusion

Recognizing the comprehensive nature of immune immaturity in preterm infants is vital for improving clinical outcomes and guiding future research and interventions.

Related Resources & Content

  1. Frontiers in Pediatrics, 2026 -- Multisystem Hemorrhage in a Very Preterm Infant Born to a Mother with Immune Thrombocytopenia: A Case Report and Literature Review
  2. the analytical scientist, 2026 -- The Baby Steps of Infant Immunity
  3. Archives of Toxicology, 2026 -- From animal models to NAMs: a paradigm shift in developmental immunotoxicity testing
  4. Frontiers in Immunology, 2026 -- Rethinking neonatal Escherichia coli sepsis: the overlooked role of maternally transferred immunity
  5. RSV Vaccine Guidance for Pregnant Women | RSV | CDC
  6. Special Situations | Vaccines & Immunizations | CDC
  7. WHO recommendations for management of serious bacterial infections in infants aged 0-59 days
  8. RSV Vaccine Guidance for Pregnant Women | RSV | CDC
  9. Special Situations | Vaccines & Immunizations | CDC
  10. WHO recommendations for management of serious bacterial infections in infants aged 0-59 days

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