A 5-year-old boy from a rural region presents with fever, weight loss, and a cough that has persisted for 3 months. His family history is significant for consanguinity, and he received a BCG vaccination at birth. On examination, he has cervical lymphadenopathy and hepatosplenomegaly. Chest X-ray shows hilar lymphadenopathy. Lab tests reveal normal T-cell and B-cell counts but low IFN-γ levels after IL-12 stimulation. Which of the following is the most likely diagnosis?
