Question: X-linked hyper IgM syndrome, resulting in high levels of serum IgM and low levels of serum IgG, is caused by a defect in CD40L expression. The specific immune event that would be prevented by a defective CD40L would be
[A].activation of B cells by T-independent antigens
failure of B cells to provide co-stimulation for Th2 activation
failure of Th2 cells to provide co-stimulation for B cell isotype switching
failure of Th2 cells to provide co-stimulation for B cell proliferation
[A].
[B].
[C].
[D].
Answer: Option C
Explanation:
No answer description available for this question.