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Difficulty: MediumPreventive Care and Immunizations

A 12-month-old boy is brought to the office for a routine well-child visit. Three months ago, he was hospitalized for a 5-day history of high fever, polymorphic rash, bilateral conjunctival injection, and cervical lymphadenopathy. He was diagnosed with Kawasaki disease and treated successfully with high-dose intravenous immunoglobulin (IVIG) and aspirin. He is currently taking no medications. The mother expresses concern that her son is not yet walking independently and only says "mama" and "dada" specifically. He pulls to stand, cruises along furniture, uses a neat pincer grasp, and points to objects. His length, weight, and head circumference are at the 50th percentile. Physical examination is normal. His immunization record shows he received all recommended vaccines at ages 2, 4, and 6 months. Which of the following is the most appropriate management for this patient today?

  1. Administer Haemophilus influenzae type b, pneumococcal conjugate, and hepatitis A vaccines; defer MMR and varicella vaccines; reassure the motherAnswer
  2. B
    Administer Haemophilus influenzae type b, pneumococcal conjugate, hepatitis A, MMR, and varicella vaccines; reassure the mother
  3. C
    Administer Haemophilus influenzae type b, pneumococcal conjugate, and hepatitis A vaccines; defer MMR and varicella vaccines; refer for developmental evaluation
  4. D
    Administer Haemophilus influenzae type b, pneumococcal conjugate, hepatitis A, MMR, and varicella vaccines; refer for developmental evaluation
  5. E
    Defer all immunizations for 8 months; reassure the mother

Answer

Administer inactivated vaccines (Haemophilus influenzae type b, pneumococcal conjugate, and hepatitis A), defer live vaccines (MMR and varicella), and reassure the mother regarding his normal development.
The correct approach involves administering age-appropriate inactivated vaccines (Haemophilus influenzae type b, pneumococcal conjugate, and hepatitis A), deferring live-attenuated vaccines (measles, mumps, and rubella [MMR] and varicella), and providing reassurance regarding the patient's normal development. High-dose intravenous immunoglobulin (IVIG), which this patient received for Kawasaki disease at age 9 months, contains pooled IgG antibodies. These antibodies can neutralize live-attenuated viruses, leading to a diminished immune response. Therefore, live vaccines must be deferred for up to 11 months after high-dose IVIG administration. However, IVIG does not interfere with the immune response to inactivated vaccines or toxoids, which should be administered on their regular schedule. Additionally, this patient's milestones (cruising, pincer grasp, specific 'mama'/'dada', and pointing) are entirely normal for a 12-month-old. Independent walking is generally achieved by 12 to 15 months, so the mother should be reassured without further developmental referral.

Step-by-Step Solution

1
Assess the patient's developmental milestones.
Cruising, pincer grasp, saying 'mama' and 'dada', and pointing are normal milestones for a 12-month-old.
To address the mother's concern and determine if early intervention is needed.
2
Evaluate the patient's immunization needs for the 12-month well-child visit.
Routine immunizations due at 12 months include Hib, PCV, HepA, MMR, and Varicella.
To provide routine preventive care based on the standard immunization schedule.
3
Determine the impact of the patient's recent medical history (Kawasaki disease treated with IVIG) on his vaccination schedule.
High-dose IVIG contains antibodies that interfere with live-attenuated vaccines. Therefore, MMR and varicella must be deferred for 11 months post-IVIG.
To ensure vaccine efficacy.

Key Concept

Administration of live-attenuated vaccines (like MMR and varicella) must be deferred for up to 11 months following high-dose IVIG therapy, but inactivated vaccines should be given on schedule. Independent walking is not expected until 12-15 months.
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Topics

Preventive Care and Immunizations

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