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Difficulty: HardPreventive Care and Immunizations

A 12-month-old boy is brought to the clinic for a routine well-child visit. His mother reports that he pulls to a stand and cruises along furniture, but she is concerned because he is not yet walking independently. He uses a neat pincer grasp to pick up small pieces of food. He says "mama" and "dada" specifically to his parents but uses no other recognizable words. He plays peek-a-boo and waves goodbye. The boy is due for his routine 12-month immunizations, which include the live-attenuated measles-mumps-rubella (MMR) and varicella vaccines. However, his 6-year-old sister recently underwent a hematopoietic stem cell transplant for acute myeloid leukemia and is currently severely immunocompromised. The mother asks if it is safe for the boy to receive his scheduled vaccines given his sister's condition. Which of the following is the most appropriate next step in management?

  1. Reassure the mother regarding his development and administer the MMR and varicella vaccines.Answer
  2. B
    Reassure the mother regarding his development and withhold the MMR and varicella vaccines until the sister's immune system recovers.
  3. C
    Refer the boy for developmental evaluation for motor delay and administer the MMR and varicella vaccines.
  4. D
    Refer the boy for developmental evaluation for motor delay and withhold the MMR and varicella vaccines until the sister's immune system recovers.
  5. E
    Reassure the mother regarding his development, administer the MMR vaccine, but withhold the varicella vaccine.

Answer

Reassure the mother regarding his development and administer the MMR and varicella vaccines.
The correct action is to reassure the mother that her child's development is perfectly on track and to administer the scheduled MMR and varicella vaccines. At 12 months of age, normal milestones include cruising, using a neat pincer grasp, saying 'mama' and 'dada' specifically, and playing social games like peek-a-boo. The lack of independent walking at exactly 12 months is a normal variant and does not require a developmental referral. Regarding immunizations, the Centers for Disease Control and Prevention (CDC) strongly recommends that healthy individuals who live with immunocompromised patients receive all routine vaccinations, including live-attenuated vaccines like MMR and varicella. This 'cocooning' strategy creates a ring of immunity around the vulnerable patient, protecting them from wild-type pathogens which cause significantly more severe disease than vaccine-strain viruses. The MMR vaccine viruses are not transmitted to contacts. While the varicella vaccine virus can rarely be transmitted if the vaccinee develops a localized vesicular rash (occurring in about 5% of cases), the recommendation remains to vaccinate; the family should simply be advised to separate the infant from the sister only if such a rash appears.

Step-by-Step Solution

1
Evaluate the child's developmental milestones for a 12-month-old infant.
Gross motor (pulls to stand, cruises), fine motor (neat pincer grasp), language ('mama'/'dada' specifically), and social (peek-a-boo, waving) are all age-appropriate. Not walking independently is normal at this age.
To determine if a developmental referral is warranted.
2
Assess the contraindications for administering live-attenuated vaccines to a patient with an immunocompromised household contact.
Healthy household contacts of immunocompromised individuals should receive routine live-attenuated vaccines (MMR, Varicella, Rotavirus) to prevent wild-type infection transmission.
To determine the safest immunization plan that protects both the patient and the severely immunocompromised sibling.
3
Synthesize the findings to select the best management strategy.
Reassure the mother about the normal milestones and proceed with administering both the MMR and varicella vaccines.
This strategy provides appropriate anticipatory guidance and adheres to CDC/AAP immunization guidelines for 'cocooning' immunocompromised individuals.

Key Concept

Healthy household contacts of severely immunocompromised patients should receive all routine age-appropriate live-attenuated vaccines (including MMR and varicella) to protect the immunocompromised family member from dangerous wild-type infections. Furthermore, independent walking is a 12- to 15-month milestone, and its absence at exactly 12 months is normal.
Estimated Time:1m 30s
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Topics

Preventive Care and Immunizations

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