A child who is being evaluated for an immune deficiency fails to make antibody to tetanus toxoid or pneumococcal vaccine, but shows normal cell-mediated immunity as indicated by a positive skin test (swelling and redness) to a commonly encountered environmental antigen. This child has an abnormality of which cell lineage?
A) T cells
B) B cells
C) Monocytes/macrophages
D) Dendritic cells
Correct Answer:
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