A 3-year-old boy presents with recurrent pneumonia, sinusitis, and otitis media. Physical examination is unremarkable.
Laboratory findings reveal:
• Low IgG, IgA, and IgM levels
• Absent B cells (CD19+)
• Poor response to vaccinations
Which of the following is the most likely diagnosis?
A 5-year-old boy presents with recurrent abscesses caused by Staphylococcus aureus, Serratia, and Burkholderia.
He also has a history of granuloma formation in his lungs.
Diagnostic testing reveals an abnormal dihydrorhodamine (DHR) flow cytometry test.
Which of the following is the most likely diagnosis?
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