A 4-Year-Old Boy Has a Yearlong History of Repeated Staphylococcal $CD4^+$

Multiple Choice

A 4-year-old boy has a yearlong history of repeated staphylococcal and streptococcal infections. He was referred to the genetic counseling unit where he was found to have depressed superoxide dismutase activity. Treatment with which of the following is most likely to be successful?

A) Interferon gamma
B) $CD4^+$ T helper cells
C) Insertion of the gene for adenosine deaminase
D) Transforming growth factor $\beta$