A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are near normal levels, but no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is the likeliest diagnosis for this child?
A. Bruton-type agammaglobulinemia
B. Graves' disease
C. severe combined immune deficiency (SCID)
D. systemic lupus erythematosus (SLE)
E. hemolytic disease of the newborn
Answer: A
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