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Difficulty: MediumClinical Preventive Services and Screening

A 12-month-old boy is brought to the clinic for a routine well-child visit. He was diagnosed with perinatal HIV infection at age 2 months. His mother has a history of HIV and intravenous drug use but is currently in a methadone maintenance program. The patient is maintained on combination antiretroviral therapy. His most recent laboratory studies from two weeks ago show a CD4+ T-lymphocyte percentage of 10% and an absolute CD4+ count of 250/mm³. He has received all routine immunizations up to his 6-month visit. Temperature is 37.1°C (98.8°F), blood pressure is 90/55 mmHg, pulse is 110/min, and respirations are 24/min. Physical examination today is unremarkable. Which of the following vaccines is most appropriate to administer to this patient at this visit?

  1. Hepatitis A vaccineAnswer
  2. B
    Measles, mumps, and rubella vaccine
  3. C
    Varicella vaccine
  4. D
    Live-attenuated influenza vaccine
  5. E
    Rotavirus vaccine

Answer

Hepatitis A vaccine
The Hepatitis A vaccine is an inactivated vaccine that is part of the routine 12-month pediatric immunization schedule. Inactivated vaccines do not pose a risk of replication or disseminated infection and are safe to administer to patients with HIV, regardless of their CD4+ count or percentage. Because this patient is severely immunosuppressed (CD4+ <15%), administering an inactivated vaccine like Hepatitis A is the most appropriate step among the choices provided to confer immunity without risking vaccine-induced disease.

Step-by-Step Solution

1
Assess the patient's immune status based on the provided laboratory values.
The patient has a CD4+ percentage of 10% and an absolute count of 250/mm³, indicating severe immunosuppression.
In pediatric HIV, a CD4+ percentage <15% signifies severe immunosuppression, which dictates immunization safety.
2
Identify the standard vaccines indicated at the 12-month well-child visit.
Standard 12-month vaccines include MMR, Varicella, Hepatitis A, Hib, and PCV.
Knowing the routine schedule is necessary to determine which vaccines are candidates for administration.
3
Filter the indicated vaccines based on the patient's immunocompromised state.
Live-attenuated vaccines (MMR, Varicella) are contraindicated due to severe immunosuppression (CD4+ <15%). Inactivated vaccines (Hepatitis A) are safe and should be given.
Live vaccines can cause disseminated disease in severely immunocompromised individuals.

Key Concept

In children with HIV, live-attenuated vaccines (like MMR and Varicella) are contraindicated if there is severe immunosuppression, defined as a CD4+ percentage <15%. Inactivated vaccines (like Hepatitis A) are safe and should be administered according to the routine schedule.
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Topics

Clinical Preventive Services and Screening

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