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Review Question - QID 213415

Table of Other Immunodeficiencies Overview - STEP I Review Transient hypogammaglobinemia of infancy QID: 213415 (M2.OMB.19.1)
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QID 213415 (Type "213415" in App Search)
A 9-month-old girl is brought in by her father for a scheduled check-up with her pediatrician. He states that over the past 4-5 months she has had multiple ear infections. She was also hospitalized for an upper respiratory infection 2 months ago. Since then she has been well. She has started to pull herself up to walk. Additionally, the patient’s medical history is significant for eczema and allergic rhinitis. The father denies any family history of immunodeficiencies. There are no notable findings on physical exam. Labs are remarkable for low IgG levels with normal IgA, IgE, and IgM levels. Which of the following is the most likely etiology for the patient’s presentation?
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