What role do memory B cells play in vaccination?

What role do memory B cells play in vaccination?

• A. They enable rapid antibody production upon later exposure
• B. They are the primary cells that phagocytose pathogens
• C. They secrete histamines to mediate inflammation
• D. They become erythrocytes in the absence of antigen

Answer: (A)

Memory B cells are long-lived descendants of activated B cells that “remember” a specific pathogen after vaccination. When the same antigen is encountered again, these cells quickly re-activate, proliferate, and differentiate into plasma cells that produce antibodies rapidly and in larger amounts, with higher affinity. This creates a fast, strong secondary antibody response that can neutralize the pathogen before it causes disease, which is the main way vaccines provide lasting protection. Other immune components don’t fit this role: phagocytes deal with ingesting pathogens, histamines mediate inflammation from mast cells, and erythrocytes are produced for oxygen transport. So memory B cells enable rapid antibody production upon later exposure.

Memory B cells are long-lived descendants of activated B cells that “remember” a specific pathogen after vaccination. When the same antigen is encountered again, these cells quickly re-activate, proliferate, and differentiate into plasma cells that produce antibodies rapidly and in larger amounts, with higher affinity. This creates a fast, strong secondary antibody response that can neutralize the pathogen before it causes disease, which is the main way vaccines provide lasting protection. Other immune components don’t fit this role: phagocytes deal with ingesting pathogens, histamines mediate inflammation from mast cells, and erythrocytes are produced for oxygen transport. So memory B cells enable rapid antibody production upon later exposure.