Neonatal candidiasis

Risk Factors - Fungal Crash Gate

• Maternal Factors:

  • Maternal candidal vaginitis
  • Chorioamnionitis
  • Prolonged rupture of membranes

• Neonate Factors (📌 CANDIDA):

  • Central venous catheters (CVC) & TPN
  • Antibiotics (prolonged, broad-spectrum)
  • Necrotizing enterocolitis (NEC) / GI surgery
  • Devices (endotracheal tubes, V-P shunts)
  • Immaturity: Extreme prematurity (< 28 wks), VLBW (< 1500 g)
  • Dermal breakdown / Congenital skin defects
  • Adrenal steroids (postnatal)

⭐ The single most important risk factor for invasive candidiasis is extreme prematurity, especially VLBW (< 1500 g) and ELBW (< 1000 g) infants.

Clinical Features - Yeast Beast's Manifestations

• Congenital Candidiasis (Acquired in-utero)

  • Presents within < 6 days of life.
  • Skin: Generalized erythematous maculopapular rash, vesicles, or pustules; scaling on palms/soles.
  • Cord: Funisitis (inflammation of the umbilical cord).
  • Systemic invasion is rare but severe.

• Acquired Candidiasis (Postnatal)

  • Mucocutaneous:
    • Oral Thrush: White, curd-like plaques on buccal mucosa/tongue.
    • Diaper Dermatitis: Beefy-red erythema with satellite papules/pustules.
  • Invasive/Systemic Disease:
    • Mimics bacterial sepsis: apnea, bradycardia, temp instability, poor feeding.
    • Renal: Fungus balls → urinary obstruction.
    • CNS: Meningitis, ventriculitis, abscess.
    • Eyes: Chorioretinitis, endophthalmitis.

⭐ All neonates with candidemia require a dilated retinal exam by an ophthalmologist to screen for endophthalmitis.

Diagnosis - Catching the Culprit

• Gold Standard: Blood culture (automated systems).
  • ⚠️ Low sensitivity (<50%); may be negative in deep-seated infection.
• Key Samples:
  • Urine (catheterized/suprapubic aspirate) is crucial.
  • CSF analysis & culture (if CNS signs or positive blood culture).
  • Sterile site fluid/tissue biopsy.
• Biomarkers (Rapid Detection):
  • Fungal cell wall marker: $1,3-β-D-glucan$.
  • PCR-based assays (e.g., T2Candida Panel).
• Screening for Dissemination:
  • Dilated fundoscopy (for endophthalmitis).
  • Renal & abdominal ultrasound.
  • Echocardiogram.

⭐ A positive urine culture for Candida in a high-risk neonate is highly suggestive of systemic infection, even with negative blood cultures.

Management & Prophylaxis - Fungus Fight Plan

• Systemic Candidiasis (Invasive):

  • First-line: Amphotericin B deoxycholate (0.5-1 mg/kg/day IV).
  • Alternative/Step-down: Fluconazole (12 mg/kg loading dose, then 6 mg/kg/day).
  • Severe/CNS infection: Liposomal Amphotericin B (5 mg/kg/day).
  • Duration: Treat for 14 days after first negative blood culture & clinical resolution.

• Management Flow:

• Prophylaxis (High-Risk Infants):
  • Indicated for VLBW/ELBW infants (<1000g or <28 wks) in high-incidence NICUs.
  • Regimen: Fluconazole (3-6 mg/kg IV/PO twice weekly).

⭐ In catheter-associated candidemia, prompt removal of the central venous catheter is crucial and associated with significantly lower mortality.

High‑Yield Points - ⚡ Biggest Takeaways

• Systemic neonatal candidiasis is a major cause of late-onset sepsis in VLBW/ELBW infants.
• Key risk factors include prematurity, central lines, and prolonged antibiotic use.
• Candida albicans is the most common cause, but C. parapsilosis is linked to TPN and catheters.
• Diagnosis is confirmed by positive culture from a sterile site like blood or CSF.
• Amphotericin B deoxycholate is the first-line therapy for invasive disease.
• Fungal balls in the kidney are a characteristic complication.
• Fluconazole prophylaxis is crucial for high-risk infants in endemic NICUs.