An infant boy experiences multiple bacterial, viral, and fungal infections during his first year of life. He has also been suffering diarrhea since birth. Tests are performed to determine the likely cause of his symptoms. Serum calcium levels are normal,

Question

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Answer 1

A. Defective interleukin-2 receptors

Answer 2

B. Failure of the third and fourth pharyngeal pouches to descend

Answer 3

C. Inability of helper T lymphocytes to switch classes

Answer 4

D. Lack of NADPH oxidase activity

Answer 5

E. X-linked tyrosine kinase defect

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