In a patient with nephrotic syndrome, what vaccinations, antimicrobial prophylaxis, and treatment recommendations should be employed to prevent and manage common bacterial infections, particularly when the patient is receiving prednisone ≥20 mg daily for more than four weeks?

Vaccination and Infection Management in Nephrotic Syndrome

Patients with nephrotic syndrome receiving prednisone ≥20 mg daily for >4 weeks should receive inactivated vaccines (pneumococcal, influenza, hepatitis B) while avoiding live attenuated vaccines unless immunosuppression is held for 4 weeks before and after vaccination, with specific attention to pneumococcal vaccination given the high risk of encapsulated bacterial infections.

Vaccination Strategy

Inactivated Vaccines (Safe to Administer)

• Pneumococcal vaccination is critical - patients with nephrotic syndrome lose immunoglobulins in urine and are at markedly increased risk for infections with encapsulated organisms, particularly Streptococcus pneumoniae 1
• Influenza vaccine reduces infection risk during seasonal outbreaks and decreases NS relapse risk (since influenza infection itself commonly triggers relapses) 1
• Hepatitis B vaccine should be administered, though response may be blunted by immunosuppression 1
• COVID-19 vaccines (all types) are safe and effective; de novo NS or relapse post-vaccination is extremely rare and responds to standard therapy 1

Live Attenuated Vaccines (Requires Medication Hold)

For patients on prednisone ≥20 mg daily, live vaccines are contraindicated unless:

• Hold prednisone for 4 weeks before vaccination 2
• Hold prednisone for 4 weeks after vaccination 2
• Exception: Patients on prednisone <20 mg/day can continue therapy if vaccination is critical and risk of disease flare or adrenal insufficiency is high 2

Specific live vaccine considerations:

• Varicella-zoster (VZV): Limited data shows safety when administered appropriately; varicella and measles can have serious/fatal courses in immunosuppressed patients 3, 1
• MMR: Insufficient data to make definitive safety conclusions 1
• Varicella exposure prophylaxis: If exposed while immunosuppressed, administer varicella-zoster immune globulin 3

Antimicrobial Prophylaxis

No Routine Antibiotic Prophylaxis Recommended

Current evidence does not support routine antibiotic prophylaxis. However, specific interventions may be considered:

IVIG Replacement Therapy

Indication: Serum IgG <600 mg/dL represents a critical threshold

• Relative risk of bacterial infection is 6.74-fold higher when IgG <600 mg/dL compared to >600 mg/dL 4
• Dosing: 10-15 g IV every 4 weeks until endogenous IgG rises above 600 mg/dL 4
• This approach reduces bacterial infection rates to match patients with normal IgG levels 4
• Pediatric data shows IVIG reduces nosocomial infections (RR 0.39,95% CI 0.18-0.82) 5

Additional Risk Factors Requiring Vigilance

• Renal insufficiency (creatinine >2.0 mg/dL) increases infection risk 5.31-fold independent of hypogammaglobulinemia 4
• Combined hypogammaglobulinemia + renal insufficiency = highest risk group 4

Infection Treatment Considerations

High-Risk Infections in Nephrotic Syndrome

• Spontaneous bacterial peritonitis - particularly in children with ascites 6
• Encapsulated bacterial infections (S. pneumoniae, H. influenzae)
• Opportunistic infections in heavily immunosuppressed patients:
  • Nocardiosis (especially elderly on prednisone + calcineurin inhibitors) 7
  • Invasive fungal infections 7
  • Herpes zoster reactivation 6
  • Strongyloides hyperinfection 3

Screening Before Immunosuppression

Mandatory screening (per FDA prednisone label) 3:

• Tuberculosis: Screen for latent TB; if positive, initiate chemoprophylaxis before or concurrent with prednisone
• Hepatitis B: Screen all patients; if positive, consult hepatology for monitoring and consider antiviral therapy
• Strongyloides: Rule out in patients with tropical exposure or unexplained diarrhea
• Amebiasis: Rule out in patients with tropical exposure

Critical Medication Management Warnings

Prednisone-Specific Infection Risks (FDA Label)

Prednisone suppresses immune function in dose-dependent manner 3:

• Reduces resistance to new infections
• Exacerbates existing infections
• Increases disseminated infection risk
• Masks infection signs
• Reactivates latent infections (TB, hepatitis B, herpes zoster)

Avoid intravenous immunoglobulin interference: Wait 8-11 months after high-dose IVIG before administering live vaccines (IVIG antibodies interfere with vaccine replication) 2

Common Pitfalls to Avoid

1. Failing to check IgG levels - This is an independent, modifiable risk factor for life-threatening bacterial infections 4

2. Administering live vaccines during active immunosuppression - Can cause vaccine-strain infections; varicella vaccine-strain infection has been documented 2

3. Neglecting pneumococcal vaccination - This is the single most important preventive measure given urinary immunoglobulin losses and encapsulated organism susceptibility

4. Abrupt steroid withdrawal - Increases infection risk through adrenal insufficiency; taper gradually per FDA guidance 3

5. Missing latent infection screening - TB, hepatitis B, and strongyloides can cause fatal disseminated disease when immunosuppression is initiated 3

6. Underestimating infection severity - Infections in NS patients on high-dose steroids can be rapidly fatal; maintain high index of suspicion even with minimal symptoms 4, 6