A patient develops poor antibody responses to protein antigens but normal early IgM responses to polysaccharides. Which pathway is selectively impaired?
Author: Anonymous
A patient has poor germinal center formation and impaired an…
A patient has poor germinal center formation and impaired antibody affinity maturation. Which CD4 T-cell subset is most likely defective?
A patient with inflammatory bowel disease has exaggerated im…
A patient with inflammatory bowel disease has exaggerated immune responses to microbiota. Which concept best explains normal prevention of this response?
A transitional B cell enters the spleen and completes matura…
A transitional B cell enters the spleen and completes maturation. Which receptor pattern is typical of mature naïve B cells?
A mutation prevents expression of VpreB and λ5. Which struct…
A mutation prevents expression of VpreB and λ5. Which structure is most directly affected?
A patient has impaired B-cell response to a protein vaccine….
A patient has impaired B-cell response to a protein vaccine. Which interaction is most essential for T-dependent B-cell activation?
A thymocyte binds self-antigen strongly in the thymic medull…
A thymocyte binds self-antigen strongly in the thymic medulla. What is the most likely consequence?
A lymph node biopsy shows B cells proliferating in germinal…
A lymph node biopsy shows B cells proliferating in germinal centers after protein vaccination. Which cell type provided essential help?
A naïve T cell receives signal 1 and signal 2. Local cytokin…
A naïve T cell receives signal 1 and signal 2. Local cytokines then determine its fate. What is the role of these cytokines?
A child has recurrent intestinal infections and reduced anti…
A child has recurrent intestinal infections and reduced antimicrobial peptides from intestinal epithelial cells. Which cells are most directly affected?