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6553 Pediatrics

A full-term baby boy is delivered after an uneventful pregnancy, and is well for the first 2 years of his life. He receives all his immunizations without any complications. Staing around his 2nd bihday, the mother begins to note frequent upper respiratory tract infections, and the child is hospitalized three times for pneumonia. Laboratory testing would most likely reveal a deficiency of which of the following immunoglobulins in this child?

AIgA
BIgD
CIgG
DIgM
Pediatrics
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