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Microbiology Practice MCQs

Browse 11,603 high-yield clinical questions in Microbiology. Includes detailed explanations, options, and topic tags.

#5159 Immunology

A young patient with severe recurrent pyogenic bacterial infections, but with normal T-cell and B-cell numbers, arrives at the hospital. Testing reveals that this patient's CD4 T-helper cells have a defect in CD40 ligand. As a result, humoral immunity evaluation reveals a significant elevation in the levels of which immunoglobulin that is present as a monomer on B-cell surfaces, as a pentamer in serum, and is initially seen in the primary immune response?

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