A 4-year-old boy presents with a chronic cough and swollen lymph nodes. His records show that he has been given antibiotics several times in the past year with limited success, most recently for a liver abscess, and that he also has a recurring fungal skin condition. Which of the following is his most likely diagnosis?

Answers:

A. Selective IgA deficiency

B. Ataxia–telangiectasia

C. A deficiency in IgG2 subclass antibodies

D. Chronic granulomatous disease

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