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Difficulty: EasyPediatric Infectious Diseases

A pediatric oncology clinic is evaluating a 5-year-old girl who is currently on a maintenance chemotherapy regimen for acute lymphoblastic leukemia. Her parents arranged this urgent visit after learning that a child in her kindergarten class was diagnosed with chickenpox (varicella) two days ago. The two children sit next to each other in class. The patient has no history of clinical varicella infection and has never received the varicella vaccine. She currently feels well, is playing comfortably in the examination room, and is completely asymptomatic. Vital signs show a temperature of 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), heart rate of 105/min105/\text{min}, and respiratory rate of 24/min24/\text{min}. Physical examination reveals a clear oropharynx, clear lungs, and normal skin without any rashes or lesions. Based on this exposure, which of the following is the most appropriate next step in management?

  1. A
    Initiate prophylactic intravenous vancomycin and ceftriaxone
  2. B
    Administer the live-attenuated varicella vaccine
  3. Administer varicella-zoster immune globulinAnswer
  4. D
    Contact the school administration to disclose the patient's medical condition
  5. E
    Administer prophylactic palivizumab

Answer

Administer varicella-zoster immune globulin
The most appropriate management is the administration of varicella-zoster immune globulin (VZIG). This patient has experienced a significant exposure to varicella (chickenpox). Because she is currently receiving maintenance chemotherapy for acute lymphoblastic leukemia, she is severely immunocompromised. Immunocompromised children who lack immunity to varicella (unvaccinated and no history of disease) are at high risk for severe, life-threatening disseminated infection upon exposure. In healthy, immunocompetent patients, the live-attenuated varicella vaccine is typically given for post-exposure prophylaxis. However, because live vaccines are strictly contraindicated in severely immunocompromised individuals, this patient must instead receive passive immunization with VZIG. VZIG should ideally be administered as soon as possible, and up to 10 days post-exposure, to prevent or significantly attenuate the severity of the infection.

Step-by-Step Solution

1
Determine the patient's baseline immune status and susceptibility.
The patient is severely immunocompromised due to active chemotherapy and is susceptible to varicella (no prior infection, unvaccinated).
A patient's immune status directly dictates the safety and efficacy of post-exposure interventions.
2
Identify the standard post-exposure prophylaxis for this specific population.
Varicella-zoster immune globulin (VZIG) must be administered.
Because the patient lacks functional cellular immunity, she cannot safely receive the live-attenuated vaccine. She requires passive immunization via VZIG to prevent severe, disseminated varicella infection.

Key Concept

Severely immunocompromised pediatric patients without immunity to varicella who experience a significant exposure should receive passive immunization with varicella-zoster immune globulin (VZIG) rather than the live-attenuated vaccine.
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Pediatric Infectious Diseases

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