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Updated: Aug 3, 2026

A Controlled Mouse Model for Neonatal Polymicrobial Sepsis
Published on: January 27, 2019
Septicaemia in newborns and infants
Insights
Neonatal and childhood septicaemia result from immature immune systems, with changing bacterial causes over 20 years. Effective treatment requires more than antibiotics, including transfusions, due to rising antimicrobial resistance.
Area of Science:
- Pediatrics
- Infectious Diseases
- Immunology
Background:
- Neonates and the elderly are susceptible to septicaemia due to underdeveloped or declining immune defenses.
- Immune mechanisms in newborns are present but lack experience in combating infections.
Observation:
- Etiologic agents causing nursery septicaemia have evolved over two decades, shifting from staphylococci to Gram-negative rods, then Group B streptococci.
- Current challenges include increasing hospital-acquired infections and evolving bacterial resistance patterns.
Findings:
- Septicaemia in infants presents distinct clinical pictures compared to newborns and adults.
- Antibiotic monotherapy is insufficient for treating neonatal and infant septicaemia.
- Treatment necessitates advanced interventions such as exchange transfusions and granulocyte transfusions.
Implications:
- The changing landscape of bacterial pathogens and antimicrobial resistance requires reassessment of therapeutic strategies for pediatric septicaemia.
- Understanding shifts in etiology is crucial for developing targeted prevention and treatment protocols.
- Further research into immune system development and novel therapeutic approaches is warranted.
Abstract:
In the lifespan of a human being the two extremes, the early childhood and old age are prone to septicaemia because of poorly functioning anti-infectious defensive mechanisms. In a newborn full term baby these mechanisms are all present but still unexperienced. The importance of both specific and nonspecific factors will be discussed. The etiologic agents, causing septicaemia in nurseries undergo continuous change. In Helsinki we have during the last 20 years experienced staphylococci to start with, changing then to Gram-negative rods, to streptococci group B and now we have increasing difficulties with hospital infections. In the treatment of these children antibiotics alone are not sufficient but repeated exchange transfusions and granulocyte transfusions are needed. In infants after the first month of life, septicaemias produce a clinical picture different from that in newborns but still different also from that in adults. Also in this age group a shift in etiology has been observed. Increasing resistance to antimicrobial agents in the bacteria encountered makes a reconsideration of therapeutic schemes necessary.
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