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Updated: Mar 6, 2026

A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis
Published on: August 12, 2020
Febrile infant update
Kate Dorney1, Richard G Bachur
1Division of Emergency Medicine, Boston Children's Hospital, Boston, Massachusetts, USA.
Insights
Caring for febrile infants under 90 days is complex. Biomarkers like C-reactive protein (CRP) and procalcitonin aid in identifying serious bacterial infections (SBI), improving infant care.
Area of Science:
- Pediatrics
- Infectious Diseases
- Neonatology
Background:
- Febrile infants under 90 days present a diagnostic challenge.
- Management strategies are evolving with new research.
- Serious bacterial infections (SBI) require prompt identification.
Purpose of the Study:
- To provide an updated review on managing febrile infants younger than 90 days.
- To focus on the epidemiology of SBI, biomarker-based management, and novel diagnostics.
- To refine diagnostic and management approaches for febrile neonates.
Main Methods:
- Review of current literature on febrile infant management.
- Analysis of biomarker utility (CRP, procalcitonin) for risk stratification.
- Evaluation of novel diagnostic tools such as RNA and protein signatures.
Main Results:
- High variability exists in emergency department management of febrile infants.
- C-reactive protein (CRP) and procalcitonin are valuable for risk-stratifying infants.
- Urine concentration impacts the diagnostic value of pyuria in suspected urinary tract infections (UTI).
- Novel diagnostics show promise in identifying infants with serious infections.
Conclusions:
- Urinary tract infection (UTI) is the most common SBI in febrile infants.
- Procalcitonin and CRP in prediction algorithms help identify low-risk infants.
- Accurate diagnosis of invasive bacterial infections in infants remains a challenge.
Purpose Of Review:
The approach to febrile young infants remains challenging. This review serves as an update on the care of febrile infants less than 90 days of age with a focus on the changing epidemiology of serious bacterial infection (SBI), refinement of management strategies based on biomarkers, and the development of novel diagnostics.
Recent Findings:
There is high variability in the emergency department management of febrile young infants without significant differences in outcomes. C-reactive protein (CRP) and procalcitonin have emerged as valuable risk-stratification tests to identify high-risk infants. When interpreting automated urinalyses for suspected urinary tract infection (UTI), urine concentration influences the diagnostic value of pyuria. Novel diagnostics including RNA biosignatures and protein signatures show promise in better identifying young febrile infants at risk of serious infection.
Summary:
The majority of febrile infants with an SBI will have a UTI but the diagnosis of invasive bacterial infection in infants continues to be challenging. The use of procalcitonin and CRP as biomarkers in prediction algorithms facilitates identification of low-risk infants.
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