7. A 2 yr old boy presents with recurrent bacterial infections and Pneumocystis jiroveci pneumonia. Labs show markedly elevated IgM and low IgG. Which of the following is the most likely cause of his illness?
7. A 2 yr old boy presents with recurrent bacterial infections and Pneumocystis jiroveci pneumonia. Labs show markedly elevated IgM and low IgG. Which of the following is the most likely cause of his illness?
💡 Explanation
7. A 2 yr old boy presents with recurrent bacterial infections and Pneumocystis jiroveci pneumonia. Labs show markedly elevated IgM and low IgG. Which of the following is the most likely cause of his illness?
✓ Correct Answer: B. Deficiency in CD40 ligand or CD40
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