A 5-day-old term neonate born to a non-diabetic mother with no perinatal risk factors presents with fever (38.5°C), poor feeding, and mild abdominal distension. The infant appears well otherwise, with normal perfusion and no focal findings. Blood culture and urinalysis are pending. What is the most appropriate next step in management?

Explanation

## Clinical Scenario Analysis This is a **late-onset sepsis (LOS)** presentation (age 5 days, no clear perinatal risk factors). However, the presence of **fever + poor feeding + abdominal distension** constitutes clinical signs of possible infection and warrants empirical antibiotics. ## Early-Onset vs. Late-Onset Sepsis: Management Approach | Feature | Early-Onset (EOS) | Late-Onset (LOS) | |---------|-------------------|------------------| | **Age of onset** | <72 hours | ≥72 hours to weeks | | **Common pathogens** | GBS, E. coli, Listeria | Coagulase-neg Staph, Candida, Enterococcus, Klebsiella | | **Empirical regimen** | Ampicillin + Gentamicin ± Cefotaxime | Ampicillin + Gentamicin (or Cefotaxime alone) | | **Management if symptomatic** | Antibiotics STAT | Antibiotics STAT | | **Management if asymptomatic with risk** | Risk-based approach (observe vs. empirical) | Observe closely; culture-guided | ## Decision Tree for This Case ```mermaid flowchart TD A[5-day-old with fever<br/>+ poor feeding<br/>+ abdominal distension]:::outcome --> B{Clinical signs<br/>of infection?}:::decision B -->|Yes| C[Obtain cultures:<br/>blood, urine, stool]:::action C --> D[Start empirical antibiotics<br/>STAT]:::action D --> E[Ampicillin + Gentamicin<br/>± Cefotaxime]:::action E --> F[Supportive care<br/>+ monitoring]:::action F --> G{Culture results<br/>available?}:::decision G -->|Positive| H[Continue targeted Rx]:::action G -->|Negative| I[Reassess at 48-72 hrs;<br/>consider stopping Rx<br/>if clinically well]:::action ``` **Key Point:** Any neonate with **fever + systemic signs** (poor feeding, lethargy, abdominal distension, respiratory distress) should receive empirical antibiotics regardless of age or risk factor status. The presence of symptoms overrides the distinction between EOS and LOS. **High-Yield:** In neonates ≥5 days old with LOS, **urine culture is critical** because urinary tract infection (UTI) is a common source. Urine should be obtained via **suprapubic aspiration** (gold standard) or **straight catheterization** (not bag collection, which has high contamination). **Clinical Pearl:** Abdominal distension in a febrile neonate raises concern for necrotizing enterocolitis (NEC), sepsis, or surgical abdomen. However, imaging (ultrasound, X-ray) should not delay antibiotics—obtain cultures and start empirical therapy first, then pursue imaging if clinically indicated. **Warning:** Do not defer antibiotics while awaiting culture results in a symptomatic neonate. Culture-guided therapy is the goal, but empirical coverage must be initiated immediately.