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Difficulty: EasyImmunizations and Vaccine-Preventable Diseases

An 18-month-old girl is evaluated in the pediatric oncology clinic. She was recently diagnosed with acute lymphoblastic leukemia and has been on induction chemotherapy for the past month. She is currently afebrile, well-appearing, and her vital signs are within normal limits. Her parents report that she missed her 12-month and 15-month well-child visits due to her illness, and they want to catch up on her missing immunizations to protect her as much as possible. Which of the following vaccines is safe and appropriate to administer to this patient at this time?

  1. Intramuscular Haemophilus influenzae type b (Hib) vaccineAnswer
  2. B
    Measles, mumps, and rubella (MMR) vaccine
  3. C
    Varicella vaccine
  4. D
    Intranasal live-attenuated influenza vaccine
  5. E
    Oral rotavirus vaccine

Answer

Intramuscular Haemophilus influenzae type b (Hib) vaccine
The intramuscular Haemophilus influenzae type b (Hib) vaccine is an inactivated (conjugate) vaccine. It is completely safe to administer to severely immunocompromised patients, including children receiving active chemotherapy for leukemia. While the immune response to the vaccine may be somewhat blunted due to immunosuppression, there is absolutely no risk of vaccine-induced infection, and providing partial protection against invasive Hib disease is beneficial and indicated.

Step-by-Step Solution

1
Identify the patient's current immune status based on her clinical history.
The patient is receiving active induction chemotherapy for acute lymphoblastic leukemia, meaning she is severely immunocompromised.
Determining immune status is critical for establishing vaccine safety and identifying absolute contraindications.
2
Apply general immunization guidelines for immunocompromised pediatric patients.
Live-attenuated vaccines are strictly contraindicated due to the risk of uncontrolled vaccine-strain infection, whereas inactivated vaccines are safe to administer.
To prevent life-threatening iatrogenic infections while still providing necessary protection against preventable diseases.
3
Evaluate the given options to distinguish between live-attenuated and inactivated vaccines.
The Hib vaccine is inactivated. The MMR, Varicella, Intranasal influenza, and Oral rotavirus vaccines are all live-attenuated formulations.
To systematically eliminate the contraindicated vaccines and select the only safe option.

Key Concept

Live-attenuated vaccines are strictly contraindicated in severely immunocompromised patients, such as those receiving chemotherapy, whereas inactivated vaccines remain safe to administer.
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Immunizations and Vaccine-Preventable Diseases

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