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An 12 month old male presents to your clinic for evaluation of recurrent infections. He had no medical problems until 6 months of age. Since then, he has developed 6 ear infections as well as 1 episode of pneumonia requiring hospitalization and IV antibiotics. He has had some loose stools attributed to use of antibiotics. On physical examination you note that the patient has height and weight in the 50th percentile and that he has absent tonsils
a. Based on the clinical history, what arm of the immune system would you suspect is impaired?
b. What laboratory tests would you send?
c. What is the most likely diagnosis for this patient?