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2 year old boy brought to doctor on background of frequent URTI and GIT infections. Was delivered at 39 weeks gestation without any complications in delivery or pregnancy. Up to date with immunizations. Has had three hospitilizations in past year for pneumonia. 1. What is likely diagnosis and why? 2. What is he most likely deficient in?

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The General Principles section of the USMLE covers these topics:
Biochemistry
Genetics
Microbiology
Pathology
Pharmacology


1. 2 year old boy brought to doctor on background of frequent URTI and GIT infections. Was delivered at 39 weeks gestation without any complications in delivery or pregnancy. Up to date with immunizations. Has had three hospitilizations in past year for pneumonia. 1. What is likely diagnosis and why? 2. What is he most likely deficient in?





 
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