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[Postnatal phagocytic maturation (author's transl)]
Insights
Phagocytic index (PI) in children increases significantly after the first neonatal month. This immune function marker, crucial for fighting infections, develops substantially from infancy through preschool years.
Area of Science:
- Immunology
- Pediatrics
- Cellular Biology
Context:
- The immune system undergoes significant development during early childhood.
- Polymorphonuclear leukocytes play a critical role in innate immunity.
- Understanding phagocytic function is essential for assessing immune competence in neonates and infants.
Purpose:
- To investigate the phagocytic index (PI) in clinically healthy children across different age groups, including premature infants, newborns, infants, and preschool children.
- To establish reference ranges for PI in pediatric populations.
- To determine the relationship between age, body weight, and phagocytic activity.
Summary:
- Seventy-two children (12 premature, 31 newborns, 25 infants, 4 preschool) were studied.
- The phagocytic index (PI) of polymorphonuclear leukocytes was measured using latex particles in autologous serum.
- PI levels ranged from 5.55-11.05 in prematures, 11.09-15.00 in newborns/infants, and 15.08-21.97 in preschool children, compared to 19.21-22.70 in adults.
- A marked increase in PI was observed after the first neonatal month or upon reaching a body weight over 4.250 Kg.
Impact:
- Provides normative data for phagocytic index in pediatric age groups.
- Highlights the developmental trajectory of phagocytic function in early life.
- Suggests a critical window for immune system maturation around the first neonatal month and specific body weight milestones.
Abstract:
Seventy two children were studied including 12 prematures, 31 newborns, 25 infants and 4 preschool children. They were clinically healthy with exception of prematurity factor. The phagocytic index (PI) of their polymorphonuclear leukocytes was investigated against latex particles suspended in autologous serum. In prematures PI levels were from 5.55 to 11.05; in newborns and infants, 11.09 to 15.00; in preschool children, 15.08 to 21.97 and in normal adults 19.21 to 22.70. PI value showed marked increase after the first neonatal month or when children reached a body weight of over 4.250 Kg.