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Difficulty: EasyPreventive Care and Immunizations

During a health maintenance evaluation, a physician sees a 12-month-old infant who was recently diagnosed with profound T-cell lymphopenia secondary to complete DiGeorge syndrome. The patient's parents report that he has not received any immunizations since his 6-month checkup. They are requesting that he receive all age-appropriate vaccines today to protect him from circulating illnesses. Given the patient's underlying genetic condition and immunologic status, which of the following preparations is strictly contraindicated?

  1. Measles, mumps, and rubella (MMR)Answer
  2. B
    Hepatitis A
  3. C
    Haemophilus influenzae type b
  4. D
    Hepatitis B
  5. E
    Inactivated influenza

Answer

The measles, mumps, and rubella (MMR) vaccine is strictly contraindicated because it is a live-attenuated viral vaccine that can cause severe disseminated infection in patients with T-cell immunodeficiencies.
The correct answer is the measles, mumps, and rubella (MMR) vaccine. MMR is a live-attenuated viral vaccine. In healthy individuals, the immune system easily controls the weakened virus to generate immunity. However, in patients with severe cellular immunodeficiencies, such as the profound T-cell lymphopenia seen in complete DiGeorge syndrome, the body lacks the cellular mechanisms to contain the attenuated virus. This can lead to severe, unchecked, and potentially fatal disseminated vaccine-strain infections. Therefore, live-attenuated vaccines are strictly contraindicated in this patient population.

Step-by-Step Solution

1
Identify the patient's immunologic status based on the clinical presentation.
The patient has complete DiGeorge syndrome with profound T-cell lymphopenia, representing a severe cellular immunodeficiency.
Understanding the type of immunodeficiency dictates which medical interventions and vaccines are safe to administer.
2
Recall the fundamental immunization guidelines for immunocompromised pediatric patients.
Live-attenuated vaccines are generally contraindicated in patients with severe cellular immunodeficiencies due to the risk of uncontrolled, fatal vaccine-strain infections.
The immune system requires functional T-cells to mount a sufficient response to attenuate and clear the live vaccine virus.
3
Classify each vaccine in the answer choices as either live-attenuated or non-live (inactivated/subunit/recombinant).
MMR is live-attenuated. Hepatitis A, Haemophilus influenzae type b, Hepatitis B, and Inactivated influenza are all non-live vaccines.
This classification allows you to differentiate the safe vaccines from the strictly contraindicated one.
4
Select the vaccine that is contraindicated.
The MMR vaccine must be avoided.
It is the only live-attenuated vaccine listed and thus poses a severe infectious risk to the patient.

Key Concept

Live-attenuated vaccines (such as MMR, Varicella, and Rotavirus) are strictly contraindicated in patients with severe cellular immunodeficiencies (e.g., complete DiGeorge syndrome) due to the high risk of disseminated, potentially fatal vaccine-strain infections.
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Preventive Care and Immunizations

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