A 4-year-old boy is brought to the physician for a follow-up examination. He has a history of bacterial sepsis one year ago and 3 pneumonias since roughly 7 months of age. Which of the following is the most likely cause of the patient’s pathology?
A) Adenosine deaminase deficiency
B) Deficiency of mucosal immunoglobulin
C) Impaired cell-mediated immunity
D) Impaired phagolysosomal fusion
E) Tyrosine kinase deficiency
