How should a 5-month-old infant with Netherton syndrome (weight 5.8 kg) and recurrent fever be evaluated and managed?

Evaluation and Management of Recurrent Fever in a 5-Month-Old with Netherton Syndrome

In a 5-month-old infant with Netherton syndrome presenting with recurrent fever, immediately evaluate for bacterial infections (particularly Staphylococcus aureus sepsis and meningitis), assess for hypernatremic dehydration, and implement aggressive infection prevention strategies, as these complications carry the highest mortality risk in this age group.

Immediate Evaluation Priorities

The neonatal and early infancy period in Netherton syndrome carries life-threatening risks that must be systematically addressed 1, 2:

Critical Laboratory Assessment

• Serum sodium levels: Hypernatremia (>145 mEq/L) occurs due to severe transepidermal water loss through the defective skin barrier 2, 3
• Complete blood count with differential: Look for leukocytosis or leukopenia suggesting infection
• Blood cultures: Obtain before antibiotics, as polymicrobial infections are common 2
• C-reactive protein/procalcitonin: To assess inflammatory burden
• Comprehensive metabolic panel: Monitor for metabolic instability

Infection Source Identification

Given the documented case of Staphylococcus aureus meningitis in a similar patient 2, your evaluation must include:

• Lumbar puncture: Consider strongly if fever persists or neurological signs present, as meningitis has been documented in this population
• Urine culture: Rule out urinary tract infection
• Skin cultures: From any areas of breakdown or crusting
• Chest radiograph: If respiratory symptoms present

Pathophysiology-Driven Management

The SPINK5 gene mutation causes LEKTI protein deficiency, resulting in severe skin barrier dysfunction that creates multiple vulnerabilities 2, 3:

Infection Prevention and Treatment

Start empiric broad-spectrum antibiotics immediately if fever is accompanied by any signs of sepsis (tachycardia, poor perfusion, lethargy), given the high mortality risk 2. Coverage should include:

• Anti-staphylococcal coverage (vancomycin if MRSA risk)
• Gram-negative coverage
• Adjust based on culture results

Fluid and Electrolyte Management

• Monitor sodium closely: Severe hypernatremia (up to 186 mg/dL documented) can occur 3
• Provide adequate hydration accounting for increased insensible losses
• Correct hypernatremia slowly (0.5 mEq/L/hour maximum) to prevent cerebral edema

Nutritional Support

At 5.8 kg for 5 months (below 3rd percentile), this infant has failure to thrive 2, 3:

• High-calorie formula or breast milk fortification
• Consider nasogastric feeding if oral intake inadequate
• Monitor growth parameters weekly

Temperature Regulation

Temperature instability is a hallmark complication 2:

• Maintain neutral thermal environment
• Avoid overheating (can worsen skin inflammation)
• Monitor core temperature continuously during acute illness

Skin Barrier Support During Acute Illness

Even during fever evaluation, continue 1:

• Frequent emollient application (every 2-4 hours)
• Avoid occlusive dressings that may trap heat
• Gentle bathing to remove scale without trauma

Emerging Therapeutic Consideration

For severe, refractory cases with recurrent infections and poor growth, consider early dupilumab therapy off-label 4. A 2024 case report demonstrated that a 9-week-old infant with Netherton syndrome achieved:

• Rapid resolution of allergic inflammation
• Normalization of skin microbiome
• Catch-up somatic and psychomotor development
• No adverse drug reactions

The authors recommend treatment immediately after diagnosis is established due to the high complication rate in early life 4. However, this remains off-label and requires careful discussion with the family.

Common Pitfalls to Avoid

1. Attributing fever solely to skin inflammation: Always rule out infection first, as the defective skin barrier creates high infection risk 2
2. Underestimating fluid requirements: Transepidermal water loss is dramatically increased 3
3. Delaying lumbar puncture: Meningitis has been documented in this population and can be fatal 2
4. Inadequate nutritional support: Growth failure compounds immune dysfunction 2, 3

Multidisciplinary Coordination

Immediate consultation with 1, 5:

• Dermatology (skin barrier management)
• Infectious disease (if sepsis suspected)
• Immunology (immune dysregulation assessment)
• Nutrition (failure to thrive)

Vaccination Status Review

During recovery, ensure age-appropriate vaccinations are up to date, following country-specific guidelines for immunocompromised patients 1. Live vaccines require special consideration given the immune dysregulation.

Prognosis Context

The first year of life carries the highest morbidity and mortality in Netherton syndrome 2, 5. Aggressive management of complications during this critical period significantly impacts long-term outcomes. Recurrent infections, if not promptly treated, can lead to sepsis and death.