Paeds · fetal-neonatal-and-perinatal
Neonatal bacterial infection and sepsis: risk assessment and management
Also known as Neonatal sepsis · Early-onset sepsis · Late-onset sepsis · Neonatal bacterial infection · Neonatal meningitis
Fellowship guide to neonatal bacterial infection and sepsis: early- versus late-onset patterns, maternal and neonatal risk stratification, the clinical assessment of the unwell neonate, blood culture and biomarker interpretation, empiric antibiotic selection with doses, antibiotic stewardship, complications including meningitis, and long-term neurodevelopmental outcomes.
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Target exams
Red flags
- Temperature instability in a neonate younger than 28 days with no alternative explanation
- Apnoea, grunting, or increasing oxygen requirement in the first 72 hours
- Poor perfusion, mottling, prolonged capillary refill, or hypotension
- Lethargy, hypotonia, irritability, or seizures suggesting meningitis
- Bulging fontanelle or parental report of abnormal movements
- Petechiae, purpura, or a grey, dusky appearance
- Maternal chorioamnionitis with an unwell-appearing infant at any gestation
Life stages
Care settings
Clinical exam formats
Board mappings
- Recognises neonatal sepsis as a clinical emergency
- Distinguishes early-onset from late-onset sepsis
- Initiates appropriate septic workup
- Justifies antibiotic choice by likely pathogen and resistance patterns
- Interprets biomarker trends to guide antibiotic duration
- Manages septic shock in the neonate
- Neonatal sepsis risk assessment and empiric antibiotic selection
- Recognition of the unwell neonate and resuscitation approach
- Counselling families about prognosis after neonatal meningitis
- Bedside assessment of the febrile or unwell neonate
- Lumbar puncture technique and CSF interpretation
- Antibiotic stewardship decisions at 48 hours
- Risk factors for neonatal infection and screening approaches
- Clinical presentation and initial investigations
- Management of complex or resistant neonatal sepsis
- Early-onset versus late-onset sepsis pathogens
- Empiric antibiotic regimens and durations
- Complications and outcomes of neonatal meningitis
- History-taking from parents of a febrile neonate
- Communication of sepsis diagnosis and management plan
- Structured assessment of the unwell neonate
- Neonatal sepsis risk stratification using the AAP algorithm
- Interpretation of neonatal inflammatory markers
- Antibiotic stewardship in the NICU
- Neonatal sepsis resuscitation and stabilisation
- Appropriate use and interpretation of diagnostic tests
- Shared decision-making about antibiotic use
- Canadian Paediatric Society approach to neonatal fever and sepsis
- GBS screening and intrapartum prophylaxis
- Outpatient follow-up after neonatal sepsis
Overview & Definition
Neonatal bacterial infection is a systemic or localised bacterial disease occurring in the first 28 days of life, and it remains one of the most time-critical diagnoses in paediatrics. The neonate mounts a muted, unreliable inflammatory response, so the window between subtle non-specific signs and catastrophic collapse can be measured in hours rather than days. Early recognition, prompt cultures, and immediate empiric antibiotics are the difference between full recovery and death or lifelong disability. [3]
Clinicians separate neonatal bacterial infection into early-onset sepsis (EOS), presenting within 72 hours of birth and arising from organisms acquired vertically from the maternal genital tract, and late-onset sepsis (LOS), presenting after 72 hours and reflecting nosocomial or community-acquired pathogens. Group B Streptococcus and Escherichia coli dominate the early-onset landscape, while coagulase-negative staphylococci, Staphylococcus aureus, and Gram-negative bacilli are the chief late-onset culprits. [2]
Sepsis in neonates denotes a systemic inflammatory response to proven or suspected infection, and it can progress rapidly to severe sepsis with organ dysfunction and septic shock with persistent hypotension and perfusion failure. The distinction between culture-proven infection and clinically suspected infection matters for epidemiology and stewardship but must never delay treatment: a global systematic review estimated neonatal sepsis mortality between 11 and 19 per cent. [5]
References10ShowHide
- [1]Stoll BJ Late-onset sepsis in very low birth weight neonates: the experience of the NICHD Neonatal Research Network Pediatrics, 2002.PMID 12165580
- [2]Stoll BJ Early onset neonatal sepsis: the burden of group B Streptococcal and E. coli disease continues. Pediatrics, 2011.PMID 21518717
- [3]Shane AL Neonatal sepsis: progress towards improved outcomes. J Infect, 2014.PMID 24140138
- [4]Puopolo KM Management of Neonates Born at >=35 0/7 Weeks' Gestation With Suspected or Proven Early-Onset Bacterial Sepsis. Pediatrics, 2018.PMID 30455342
- [5]Fleischmann-Struzek C The global burden of paediatric and neonatal sepsis: a systematic review. Lancet Respir Med, 2018.PMID 29508706
- [6]Polin RA Management of neonates with suspected or proven early-onset bacterial sepsis. Pediatrics, 2012.PMID 22547779
- [7]Kuzniewicz MW Update to the Neonatal Early-Onset Sepsis Calculator Utilizing a Contemporary Cohort. Pediatrics, 2024.PMID 39314183
- [8]Kuzniewicz MW Antibiotic stewardship for early-onset sepsis. Semin Perinatol, 2020.PMID 33221072
- [9]Thomas R Long-term impact of serious neonatal bacterial infections on neurodevelopment. Clin Microbiol Infect, 2024.PMID 37084940
- [10]van Leeuwen LM Diagnostic value of maternal, cord blood and neonatal biomarkers for early-onset sepsis: a systematic review and meta-analysis. Clin Microbiol Infect, 2024.PMID 38467246